This is what I was trying to point out. You start off fine then a person does something human and you go right to defense mode making hostile labels, she’s flaky. Or if she’s not flaky she most be evil and is trying to push you out of her life. Black or white thinking.

Given your age she can simply be a kind agreeable person who forgets a lot. She sounds like a very nice person. There’s a thousand innocent reason for her actions. Not two. The label flaky is judgmental and harsh. The thinking she has evil machinations is you projecting your own fears.

Just have a no confrontation talk and ask her if she notices she forgets things a lot. That it upset you because you think it means she’s trying to dump you. That’s honest. Not labeling people and dumping them because they’re human.