I don't have much experience with orchid mantids, but I can tell you that I have a female Hierodula majuscula who has been an adult since July 15th, 2018 and successfully mated with my male just last week and I'm waiting for an egg case now. Again, not an orchid, but another tropical species.
I agree, she should be perfectly ready to mate. Have you seen her do any calling behavior? Mantises usually do it at night so it is hard to spot sometimes. Good luck!