85 is a little high. But not the point I am interested in. My understanding is this is a year old female, (are you sure it is a female have you probed her?) and that until two moths ago she was feeding fine? What is her weight?

I am assuming that you track her husbandry? Has anything changed the temps the enclosure are all basically the same? If so I'd not worry much often Royals will stop eating during the breeding season. It maybe simply that the 'female' (I question that as it is typically males that go off at 1 year and females later but there is no absolutes) has decided to stop. Barring weight loss lethargy and loss of muscle tone or acting oddly. There is quite possibly nothing wrong. I like ambient air temps in your range but I still make sure there is a cool spot in the 79-81º range as well, but in truth a feeding royal 'happy' and healthy that stops after insuring that healthy and no big changes in husbandry it is just likely coming of age fast and nothing to worry about.

Keep weight checks and husbandry checks and keep offering perhaps a bit smaller than normal less than 10% 5-7% maybe and she will eat when she is ready.