I am working on a stoic mindset, but have a tendency to get angry/upset over little things.

Anyways, met this girl a while back and I've been seeing her here and there. (Not a plate yet but that's the plan). We had made plans to see each other this Wednesday, but she texts me saying she's busy and if we can do Tuesday instead. However, I'm busy that day so she asks me about Friday.

I know she has an interview on Friday so I ask her "won't you be busy then". And she replies with "yea but I'll try to make time after!" After seeing this, I just lose frame and say "Try??" and she responds with "most likely!" and ensures me later after I stop replying by telling me friday for sure and using tons of smileys.

I know texting should be used solely for logistics and that was my intention, but I lost frame after feeling so degrading. Who the fuck does she think she is, "trying" to make time?

Does this scenario imply she sees me as a beta and should I hard next..I was really tempted to go nuclear but I didn't. I've never felt this angry from a girl in a long time, but I could really use some advice of how I should have acted. Thanks.

Edit: or am I completely over-analyzing this and does it mean nothing?