A couple of ideas tht might help.

Grab yourself a step stool and you can squat beside the bath, good for labour and nicer on your knees.

We have a shower attachment which connects to our taps (cost about $5) I use this to wash DD hair in the bath and close the shower screen and let her play with it which she loves

non slip bath mat inside the bath

my DD has learnt not to slip and how to cope if she does, not that I would ever be more than arms reach away but she bathes with her big brother and had to be tough.

All the best