I think the problem here is that you can't possibly give enough background for people to understand how you're feeling, & I'm fairly certain that if I did go into detail about my situation people would be saying pretty much the same to me as they're saying to you. (my mum was also under a lot of stress at the time). The way I see it is this - you're UPSET. That's what you need help getting over. I'm bloody upset with my mum too, because she hurt my feelings & from where I'm sitting she doesn't give a toss. I WANT to get over it, because she's my mum, & she's been a good mum (though a human being, so she's stuffed some things up from time to time!) We were close, & I want to still be close. I'm just finding it hard to let go of how hurt I feel that my mum (who does a million things for other people, who was the first person I called with stupid bits of news about the kids) could be so careless with my feelings.
If it was as simple as forgetting it & moving on I guess you would have done that already (& so would I!)
I think cancelling the trip was the right thing to do, because the way you're feeling being forced together for even a couple of days could have ended badly. I'm lucky because my mum is close by & so I can see her for small amounts of time & then leave if it starts to feel tense.
Mostly what I have done is forced myself to see her, & forced myself to call her (though I have to be feeling quite brave!)The more I pretend everything's normal, the more normal it seems. I try not to, but I do find myself dwelling on what she said & getting upset about it all over again. It's not healthy, but it's hard not to do it.
TBH, before all this happened with my mum I would have probably been one of those people thinking you should swallow it & move on. I think deep down it's what you want to do, you just don't know how (& neither do I!)
Mother/daughter relationships can be so complex, & it's kind of impossible for people who don't know you to appreciate how deep the hurt can be. I think the only other thing I can say is that I know my mum's hurt too & I really regret that. She's selfish & also quite manipulative (in a "nice" & quite subtle way), but I guess no one's perfect. I'm not sure I'll ever stop being upset at what she said, & I would (I hope!) find it easier to forgive her if I thought she was actually sorry. I'm trying to just accept that it's the way she is. I have to say though that the more I pretend to be normal the easier it gets, & also that when I'm talking to her I find it easier to remember that I love her. When I avoid her for a couple of weeks I find I focus more on being hurt & upset... I really do have to force myself to call though (which is sad, cos I used to call her a lot & then talk about nothing for ages!)
Hmmmm - seem to have managed to use loads of words without any of them being very useful to you (again!). Personally I would keep texting her, but not to try to get her to accept how you're feeling - if she hasn't done that by now she's probably not going to, (& if you're anything like me, every time you fail to explain how upset you are, you'll get a bit more upset). I'd keep them fairly casual & friendly, but it'll keep the lines of communication open until you feel like you can talk to her again.