Gf (49 F) keeps getting mad at me (39 M) for things that seem inconsequential to me. What am I missing?

We have been dating for 4 months now and she gets mad at me for things I truly don't understand. I need help understanding what I am seeing/experiencing so I can figure out what to do moving forward. I will give you a couple of examples:

1. We were going to watch a movie at her place with her daughter. Prior to the movie I had lied down on one couch while her and her daughter were upstairs getting ready. The come down and both sit on the other couch. Movie starts. Gf asks if Im comfortable or if I want to come over to their couch to cuddle with her. I say that I am comfortable for now and that I'll come over in a bit. My gf then tells me "if you have somewhere better to be then you can go" I ignore this for the time being because I don't want an argument to happen in front of her 15 year old daughter. Once we go to bed she tells me I am inconsiderate for not coming to cuddle. I didnt think it was such a big deal with made her very mad and she kept getting angrier and angrier… after multiple hours of this I told her I needed a break from the conversation and said that I should go home for the night and we could talk when we both cooled down. She then snapped on me and accused me of attempting to leave her – "Oh, now I see what I mean to you if you're just going to step out like that"….. I never once implied I was done.
2. I was brain storming how I could make more money by acting on certain job opportunities I have available to me. I mention working in mineral exploration, which would take me out of town for weeks at a time sometimes, and she snapped on me… told me that she can't do shift work and that shes 'horrified" that I would choose work that would take me away from her rather than find something closer to home… she said "you'd choose that over me"
3. I was sick on Thursday but she wanted me to come over to her place for dinner anyways. I went over but soon after I got there I realized I was feeling much worse that I realized prior to going over. I told her that I was going to go home to sleep and that I wouldnt be able to stay for dinner. Again, she got very mad at me and accused me of being inconsiderate, selfish, and that I flaked out on her. She said that I am not a stable person and that she needs a stable man in her life.
4. We were at a restaurant having a nice dinner and good talks. At some point two random women walk into the restaurant who clearly know the bar staff that work there. These women start a loud conversation with the bar staff and due to all the noise I glance over at them to see whats going on. At this point my gf immediately stops communicating at me… I try to understand why but she wont tell me. Eventually she confronts me by saying that she noticed me checking out the women who walked into the bar.
5. In these arguments she often tells me that our relationship is one sided and that she has to put all the work in. I dont understand this because I often ask to see her, change plans to see her, I pick up and drop off her daughter at school all the time and I've taken her out for dinners and drinks more times than I can count. She said she "pays" for all our trips but the only trip we went on was free accommodations, I drove us there and paid for the gas, and I also paid for all the food and drinks while there.

These are just a few examples. Please help me make sense of this.

TLDR: Gf is getting mad at me frequently for things I dont understand. I am really confused. I'm looking for some perspective here.