Thanks for the suggestions, but I believe she is fine now. The suit will stretch a little bit with wear and also the use of plastic bags helps. Zippers would be nice (thanks for the offer), but she doesn't think they will be necessary. Also, she tells me the fit is good once she has the suit on - she claims not to feel constrained in it and she also had no trouble reaching her valves when we took a cave course.
This suit is just the type of design that is naturally difficult to put on. First it's a thick 7mm suit with attached hood:
And it has another 5mm built in vest for a total of 12mm (where attached) to squeeze her butt through:
And given the design you have to go through the left shoulder/neck hole (it has a Velcro strap):
And once you make it through you have to deal with getting it past the heals with no zippers, and the material is slick and tight on her, so it's difficult to fold up to get a good grip to really pull on it:
Personally I think it just needs more raw force - she should work out.
Other than that it's a great suit and with her build (5'5.5" and 105#) it's about the only stock size that will fit. In fact, she just sold all her other suits that didn't fit well and bought another O'Neill (5/3mm for warm water) in the same size.
I guess she could get O'Neill's size 6, but I'm afraid it might not keep her as warm because it would be looser. Having said that, I think O'Neill currently only has drysuits from size 6 up for women, so she might have to get one of those when she goes dry.
Thanks for the help.