She won't get vertical breeding bars from a gourami touching her.
How big is your tank?
Just a note though: Gouramis and cardinal tetras really don't mix. They're a bit too aggressive to co-exist with them.
Also, you need 5x cardinal tetras and 4x corydas for a group...they are both schooling fish.
She's probably very, very stressed out. I would remove her from that tank and place her in her own heated tank. If she is recovering, being around other fish is a bit stressful.
By the way, don't just "plop her in" when you think she looks ready. You didn't condition her properly or introduce properly. So the real question isn't what's mentally wrong with her