This is why you never let nurses play with your skin, they're simply not qualified enough.
What she said about your lack of healing sounds like a cop-out to me, to seemingly shift the blame and discourage you from suing. A competent practitioner would have tested your healing ability first before proceeding, that was their responsibility, not yours.
As far as copper peptides go, don't bother with them, at best they're mildly effective in combination with strong exfoliation, at worst they're an outright scam.
Since that looks like a deep pit you should look into a treatment called TCA CROSS, its very simple yet highly effective and should gradually fill the pit in, at which point you can consider a resurfacing procedure.
The thoughts of attending a cosmetic surgeon is a bit scary, u originally attended the clinic for some small icepicks but was talked into this Rf for some acne. I've already handed over a good sum of money to this clinic, she's not offered aby refund I kind of feel committed to let her try to fix with the Restylane...