I'm considering leaving my (30M) girlfriend (31F) over something she did over six months ago?

I could use some unbiased advice on this. Regarding a situation involving my girlfriend (31F) and myself (30M).
So basically my father passed away this year. He had been unwell for a few years but hit a pretty sudden decline (**** cancer). God rest his wonderful soul.
Shortly after I was made aware that the cancer had spread from it's primary to multiple secondary locations. I had an opportunity to go and spend the weekend with my father just us two. As his girlfriend was going away for the weekend. This was an incredibly rare opportunity. In the sense that looking back, I can't remember the last time I had the opportunity (5yrs+).
It was obviously bittersweet, because he was unwell but I could tell he was trying his best to make the most of it too. On the Saturday we decided to walk into town and get a bite to eat and a glass of wine or two. My girlfriend was staying in my apartment back home while I was there. In all honesty I don't remember why she stayed, there was a reason she asked to stay i.e. she needed some time out or something. Strange, writing it I don't remember the reason! Though I've had a drink so likely that).
Anyway. She decided to get really drunk in my apartment and started sending me text messages early on in the evening about how she was going to kill herself, or words to that effect. Literally asking me the best way to do it and stuff. Then when I told her that I wasn't in a position to help her at all (being 400km away) I was going to call her family or the police if she didn't explain herself. She stepped back and started being a lot more covert but still referring to the same thing and it took my attention for the entire night. Even after dinner once we walked home and my father had gone to bed. I was calling her, all worried and stuff.
That was the last night I had just my father and I, before things went downhill shortly after. After that it was the whole family, his partner, groups etc. Anyone that has been through it knows.
The morning after I text her concerned and she text me saying words to the effect of 'You need to come home now baby' and when I drove home (6+ hours) I got in all concerned and she was all 'I DON'T want to talk about it'. Then I had to go out and get us dinner.
Never once apologised for it, would refuse to discuss it till it was eventually 'forgotten'.
But now I am coming out of my grieving phase ever so slightly. I'm reflecting on it and starting to feel a sense of incredible resentment I just can't shift. Incredible resentment. I feel like if I did that, the guilt would just consume me. If I took that from someone.
On top of that, the day after the funeral she was going to leave early and go home because she was offended as nobody at the funeral knew her. She felt like I hadn't told anyone about her, when really these were people I hadn't seen myself in several years! When we've only been together for 2.5 years. I explained to her that I had an interesting family dynamic (separated parents etc. leads to interesting dynamics) but she wouldn't have it. I had to take the day out after the funeral to take her out for dinner to bring her round, so to speak.
I feel like it's been so long now it isn't valid. You know? The grief is running circles with my mind and i don't know if I'm just looking for someone to blame for it. Does that make sense?
Maybe someone has some advice on how to approach this? I know she suffers from depression but refuses to tackle it practically short of me going and finding her a therapist myself. I don't know if I have too much empathy or am being too cold/not understanding her issues.
Thanks for reading.
To confirm I was driving home on the Sunday either way. I didn't leave earlier because of it. Maybe a couple of hours.
TL;DR I feel my GF was incredibly selfish during a time that should have been just about my father and myself. On top of that she never seemed willing to discuss it again and seemed to show no remorse even making his funeral about her instead of him.


Source.