Also the thing she points to as evidence reflect more on OP than OPs mum.

Evidence #2 is a very valid point for a pregnant person and OPs mum probably told her not to because of the added risk of COVID. Evidence #1 sounds mean, but I think that depends on how it was said and likely is directly related to evidence #2 (i.e. mum said don't do that because you might get sick which puts your baby at risk. OP didn't listen and got sick, OPs mum was irritated at OPs attitude and that was something she had in the chamber and foolishly said something extreme).