Agree we all had tight vaginas on before birthing vaginally before.

The only thing I would think perhaps increases her risk is the surgery to remove the ovary with the c/s. I would imagine the best thing to do at the time would be to do the c/s, close the incision then take the ovary out so her risk would be no greater then the next lady who has had a c/s. If for some reason they didn't perform the usual lower segment c/s or the incision was much bigger then normal then her risk would be greater but its not like they can remove the ovary from the inside of the uterus so I can't see why her incision would be any bigger then the norm.

Where I work they do induce for VBACS. The only thing they don't do is use the prostins gels but they still occasionally use a catheter (also not common) and they do use syntocinon and ARM. I think it all depends on stupid hospital policies and having the support from the Ob which clearly she will not.

I hope your SIL has a very positive birthing experience and gets the support she needs.