Does it sound like she’s being petty or am I reading into it to much?

I didn’t think about it at first but now I feel like it’s just pettiness. If she texts or calls me and I don’t answer but I call her back when I can, she won’t answer or she will text me “never mind I have plans now” . if she asks to hangout one day and I say I can’t but if she wants to do something the next day Id love to- she won’t respond for hours or even the next day and says “I think I have plans sorry”. Mind you, I don’t always tell her I can’t or that I have plans. 90% of the time I tell her yes but all the times I have said no, she gets weird.

She asked if we could move some of her stuff into storage and I said yes but I wouldn’t be free today because I was helping my sister. She got distant and said okay well it needs to be done first thing super early tomorrow morning then.

She text me today if I wanted to hangout and I said I was having dinner with my sister but afterwards we can and if she wanted to hangout tomorrow too. She waited hours and then said. “No I think I have plans that day and nvm about today, I have plans. Anyways, can I move my stuff to your storage tomorrow first thing in the morning”

It just seems petty. It makes me feel like it’s hard being her friend.