No those are whore shoes to me. Its fine if you want to wear those out on your clubbing night but NOT for someone elses wedding! Those would be fine even if YOU wore those, not a BM trying to steal the show.
I am so frustrated with ppl trying to make the day about them and what they want. You were more than generous enough to let her pick the style, so she needs to at least listen to the rest of your wants on YOUR day.