Fed up today!

Visiting MIL abroad for the week. Since I got pregnant I have had a really hard time with her but managed to keep my cool since she lives on another continent… But carrying some serious hurt and resentment over things she did and said when she came to visit in Feb, and more over the phone since then. I really feel like I need to address all of this as it’s still festering in my head and I’m tired of being angry. The challenge is that she is extremely sensitive, I’ve never needed to raise a difficult topic with her til now (somehow!) and I’m very conflict avoidant. So I’ve just been letting it simmer 🙈 Until today in person (3days into 6day visit) when she wanted to squeeze 3 adults into the back of the car alongside LO in car seat and I point blank refused. (There was zero need as there was a second car available to spread out and it was for a visit to a park, nothing essential). She kept pushing back until I had to very firmly refuse and told her me and LO would not come if she insisted on doing it. Apparently she was in tears about it after and things are awkward now. I know I was probably more forceful than I would normally be because of the underlying anger that I still have, but at the same time I’m glad I stood my ground on this and think it was pretty unreasonable of her to try pressure me into taking a totally unnecessary safety risk. I’m kind of hoping this mini conflict can open the door to resolving the bigger stuff but not really sure how and when to shift the convo there… my husband reckons a) in writing and b) after this visit so we can still have a nice visit and have a level headed exchange but part of me feels like it’s a bit of a cop out to not be honest to her face (nicely) I know there are others here navigating tricky in law situations so appreciate any advice and / or commiserations!