I [26F] and my sister [18] are graduating on the same day and sister is upset

I am finally graduating with my Masters degree this May and just found out that it falls on the same day that my little sister is graduating with her associates degree.
I sent a text to my sister about it and her reaction was one of rejection and disappointment. She even went as far as to tell our family to not bother going to her graduation.
My sister is the middle child and often gets left out or ignored when she has accomplishments, so I feel really guilty about the way that things have turned out. I don't want to overshadow her accomplishments. At the same time, I have really struggled to finish this degree and have often thought about giving up a lot in the last few semesters (a 60 hour grad program is no joke!)
I guess I am unsure how to get the support I want (cuz my family hasn't always acknowledged my struggle in this program, honestly) and also make sure my sister doesn't end up feeling unimportant.

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tl;dr: My sister's and my graduation fall on the same day and sister's feelings are hurt. How do we both ensure we both get acknowledged for the hard work we've done?
EDIT: My sister is also having 2 graduations (one for the associates and another at her high school). Her high school is one where the majority of the kids have 2 graduations because it is a prep school.

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EDIT 2: Thanks everyone for your input! I went ahead an let my family know that they really should go see my little sister graduate and that we can meet up for a graduation lunch or dinner afterwards with everyone there. My mom might still try to go to my graduation anyway, but that's on her. My sister seems excited about this plan, though. Thanks again!


Source.

Sounds like it got worked out....

Really glad to hear the update...smart way to arrange things. Good job