Just wanted to provide some updates on this.
I recently discovered another site where this user had been doing even more commissions (besides the Belle Delphine pic) under another username she used to have before using "Loodii."
https://artistsnclients.com/slots/29152-hentaiecchi-nsfw (Link is NSFW)
The dA commission info link she has here was created in July 2019 and is not the same one that she had been previously using for past commissions, so I guess I know now for sure that she had been actively logging onto dA (to some extent, maybe?) and leaving my recent notes on dA on re