Bec,
How do you think she would go in the shower with you??
I know that my littlies around 1 1/2 loved to come into the shower at the same time as me,,,that might be an option to save you having to lift her in and out of the bath??
I think around 2, maybe a bit younger, my boys started getting into their car seats for me. I found having a "special" toy that was always kept in the car, was a great encouragement, as they were only ever allowed to play with it in their seat.