Can prazi pro help a new ray to eat?

Some treat wild caught rays prophylactily with Prazi or other parasitic meds, But since Prazi only targets specific parasites its pointless unless you treat with multiple parasitic meds to cover a larger variety of parasites. Or a much stronger med that treats all.
With that being said, is your ray captive bred or wild caught. If captive bred give it plenty of time. I once had a CB pup take 9-10 days to start feeding. Keep live foods such as ghost shrimp, blackworms or even red wigglers ( they can live weeks even months in a tank unless salted). It should eventually eat.

Lights off, tank covered even turn heat up a little to increase matabolism. Main culprit for new arrivals of not eating is. stress.

If its wild caught it is more of a concern as they usually have been starved and mistreated for several weeks prior to import unless its been sitting at a vendors or wholesalers for a couple of weeks or more.

I don't think I would use prazi specifically for that purpose, especially since stress could be a factor here and medication can stress fish, but I do believe it is a side effect of it's use, a lot of my fish had their appetites boosted huge because of its use. I had 2 retics that only ate earth worms, despite how hard I tried. Day after the first dose of prazi, on shrimp and tilapia like it was never an issue, and tons of it. Be careful though because I have heard rumours (cannot confirm) that prazi can crash your biofiltration and fluctuate your PH. Don't know if this is true or not, I suspect not, but thats the last thing you want for a ray that's not eating.

I would not use prazi as a food enticement. You should just offer the foods known to be successful like live earth worms chopped, live black worms, live ghost shrimp and continue the waiting game. As you said, minimize stress by keeping low lighting, water conditions etc. good luck.

What was she eating before you got?

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Ray will be OK, give it more time

Prazi doesn't have a positive effect on appetite. The increase in feeding response is related to a healthier ray eating more after taking care of parasite problem. Prazi can actually stress a ray out and slow down eating during treatment.

As stated, wait it out. That's a fairly new ray. It will take time.