I’m sure the more bespoke options can be made that way. I just checked the red wing site and it looks like their heritage collection come in at a max of size 14. That said, they generally run big (1-2 sizes) so it might be worth visiting a store and trying something on if you can.
Have you had any romantic interactions with her at all in any act? If not, I doubt you’re getting frisky with her starting in act 3, but I could be wrong.