My fiance (28f) stays out for HOURS every night and is lying about it and it's broken my heart

tl;dr - My fiance's job closes at 10pm and she regularly gets home at 3-4am, sometimes later. I don't really think she's cheating or anything nefarious, but she's definitely fudging the truth for all those unaccounted-for hours and my heart is beyond broken. Her late hours and lack of communication have me feeling like a roommate rather than a future spouse.
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For many years, my (30m) fiance (28f) worked a 8-4 job just like me. We would see each other every day and life was so grand. But her job wasn't a great fit and she eventually left, stumbling into the craft cocktail industry in 2021 and realizing that she had really found her niche and passion. She began as a bartender at a very upscale restaurant that does craft drinks and it wasn't long until she was bar shift lead, then bar manager, and now is training as assistant manager for the entire restaurant. She's really busted her butt and has worked incredibly hard to move up the ladder in this industry that she loves.
However, our schedules have switched from parallel to completely opposite. I work morning to afternoon and she works afternoon to night. I never see her anymore.
Something that has become a major problem is the fact that she has started coming home hours and hours later than the operating hours of the restaurant. I realize that when restaurants close, say, at 10pm like her's, closing staff is sometimes stuck for another hour or two afterward. I get it. And if she were coming home at midnight or even 1am it would make sense.
But lately she's been getting home at 3:30, 4:30, and even one time I was getting up for work at 5:45am and she was still not home yet. I wake up in the middle of the night to an empty bed and the kitchen light still on, signifying that she hasn't been home. I've already confronted her, asking why she's out so late and if she can just send me a single text, just one, so when I wake up at 3am and she's not there I at least know she's not dead. She apologizes and says she'll be sure to send a message.
But it keeps happening - out late, no text. Out late, no text. I confront her every time because it truly scares me that she might be in an accident somewhere and I have no idea when to expect her back so I don't know if I need to call for help. She always apologizes and says it won't happen again, but then it does.
She tells me "Oh, I've just been sitting in my car listening to music" or "I was talking with a friend about serious stuff in her life" but I've come to find out that sometimes she is not telling the truth:
"I just went to X-Bar for a drink with a friend." But then her coworkers will post images of her at Y-Bar or Z-Bar in a huge group on their Instagram stories. Why would she leave this out? There's not one specific person she's ever with, I really don't have any suspicions that she is cheating.
The breaking point has been last weekend and then last night. Because we work opposite schedules, we basically have to plan the time that we will see each other. Last Friday night we had a plan to hang out when she got off work, and she texted me at around 11pm from work asking if we could have a cute hang-out at home. I said hell yes and stayed up, turned on some jams, poured some wine and got a movie ready. No call or text, she comes home three hours later at 2am. By that point, I'm going to bed. She says "Sorry, took forever to close up" and that she was too busy to send me a text the entire three hours.
And then last night. She was getting out early, she texted me at 9:55pm saying "I'm about to set the building alarm and walk out." And the next thing I know, she's crawling into bed at 4:35am this morning. Six and a half hours totally unaccounted for. I've been at work all day and haven't been able to talk to her about it yet.
I guess what I really need is another angle - is there someone in the restaurant industry who can attest to it taking many hours for closing? That you're too busy to send a text about your lateness? I feel insane and totally, totally lonely. If you couldn't guess, we got engaged right before she took this job. I'm not sure we would be engaged now if any of this had been happening before.
INFO: Fiance and I have been together for 8 years


Source.