Yes, liquify might be tricky. But still, do you mind if I try? We should rule it out definitively before attempting the more complex option.
So may I see a crop of the full width of her body?
Well, it would be safest not to assume anything.
It's possible they are saving as PNG, and if that's the case, then yes, 24-bit is essential. The other option is 8-bit, which will be very poor quality.
What software do they have?