Hi @RainbowEsounds like you are having a really tough time at the moment!
My son is now 6, diagnosed with ASD and ADHD at around your daughter’s age, he would not have a bath, he will kick scream, and it was dangerous for him, so for a while I just washed him a flannel, stood in the bathroom. After a few months he decided he liked baths again, it has happened again since, and again the more I push him the worse it gets. If you do think she could be bribed, the bath foams are fun for them, and great for sensory play.
As for going out, do what is best for you both, don’t worry about anyone else’s opinion! We tend to do the park in cloudy, showery weather and soft play on the hot days, the opposite to most people so it’s quiet.
My biggest recommendation is finding someone in the same boat as you, either through a local meet up, or online, as they will understand, and you will feel less alone on the bad days!