That sounds exactly like my two Elaine. They were more than a year old before I found the solution that worked for them. I had bought them a paddling pool and realised that if I filled it with water and let them hop in clothes and all they were fine. If I tried to put them in with bathers on or heaven forbid no clothes on they both went into screaming mode.
I have no idea why they hated being naked in water but they did, right from their very first bath in the maternity annex.
Once I clicked that being in the bath with clothes on was ok for them, I let them bathe with clothes on for a couple of weeks, they didn't get very clean but they got used to being in the bath. Then I would get in with them with my clothes on over a period of maybe a couple of weeks I would say "oh this wet tshirt feels yucky, I'm taking it off" then they would want their 'yucky' wet t-shirt off. It literally only took a couple of weeks to get them happy being naked in the tub, then they would get naked before they got in the tub and never looked back but that first year was a killer.
Greg always loved having a bath, I have no idea why the other two didn't

I don't know if the same thing will work for Grace but it may be worth a try. It is the wrong time of the year for an outdoor paddling pool to start with but maybe a baby bath in front of the heater for her to play in fully clothed might work. It is going to create a lot of wet clothes but you have to wash clothes anyway right?
Good luck and I hope something works for you. Let us know how you get on
