Some great suggestions here already! But I want to emphasize patience (it can take days, weeks, months, years). And if they're not happy, stop. It could do more harm than good relationship-wise. If they're not accepting a bath in any way, shape, or form, I would suggest getting a tiny diffuser an placing it by the cage. Don't use any essentials oils (at least not without doing some extensive research) but just distilled water. This will at least provide enough humidity in the nearby air to help with skin and feathers. Don't leave it on all the time and introduce it very slowly (and far away, at first).
Also, one strategy I've used in the past that works with *some* birds is to use the shallow bowl of water and THEN spray the bowl (not the parrot). If they feel like taking a bath, they'll join in the fun! Another (crazier) idea I can think of (haven't tried) is to try misting yourself first and see if this gets her in the mood. But mostly, take it as slow as you can. Hope this helps and please keep us posted if you can! Good luck!
PS: you might also want to try a different bottle (smaller, different color or clear). It could be a sad coincidence that they don't like the particular bottle or color. This has happened to me before and changing bottles made a world of difference. But again, slowly.