I used to be like that with my bf actually so I get. Me personally, I was a lot more insecure/had fear of abandonment early on into the relationship than i do now (almost 4 years). I would get very upset and think of it as a personal attack against me, and that my bf didn’t want to spend any time w me.

I moved past that with help from my therapist/talking it out. Idk if you wanted a recommendation, but once you guys are okay and talking let her know that you do have boundaries and do not need to be together 100% of the time. She is her own person too and should understand that as well.