Red Eyed tree frog with intermittent light green spots/blotches

[Charlieamanda]

I'm frog sitting my friends Red Eyed tree frogs, two males and one female. Ive watched them now for several summers due to extreme temps in his NY apt, but he's moving and I'm keeping them until he's moved in, so they arent exposed to excessive and needless stress.
For whatever reason this year the female has been getting light green spots, which we initially treated with flagy, several times, and they went away. After treating her a few times with the flagyl we decided not to medicate her, but to just watch her and see what happens hoping they would go away on their own and they did.
She's getting these spots/blotches all the time now, seemingly out of nowhere, but when they appear they then disappear just as quickly. We no longer treat these spots/blotches assuming it's a phase in between her color changes, light to dark and vice versa.
The other two Red eyed males in her tank do not have this problem she seems to be the only frog affected. She looks good is active and eats very well, but I'm in hoping this is not a sign or symptom of another problem.
I keep the temperatures berween 68' and 76', ave 74', and at 60-70% humidity. I spot clean the tank regularly and do a full cleaning every few wks, or when needed, and change their "pool" water every other day. I have well water so its not treated. I keep a cricket bowl in their tank, so food is always available, I refresh the crickets and dust them daily.
The one males has "mounted" her multiple times, she's not a willing participant, and usually manages to "free" herself, but he's managed to hang on a few times for a couple of hours. At first we thought this was the reason for the abrasions causing the spots/blotches.
Has anyone heard of red eyes having these spots/blotches in between color changes?
Or seen these come and go quickly without treatment?
Any explanation, advice or information would be appreciated.
I'm going to try to post a picture of the most recent episode which disappeared less than a half hour later.