Thanks for the suggestion. I found Siam too, just after the OG post. Siam had a nice roof/pool/view, but wasn't quite the vibe, and the location was a bit too isolated for mumsy! Just an update, we found a place in Phratamnak that had everything we were looking for (plus not a mega condo, so more communal too) plus the owner was kind enough to offer netting and all kinds of other protections for the balcony/cat (we will decide the best method when we move in, and likely keep the cat indoors mostly anyway).
Shout out to the cat-lover post above too - our cat is female so way cleaner than male cats - they lick their fur more often and spend a lot of time washing, this is due to the fact female cats hunt, that said, she is spayed, so doesn't have that instinct as much anymore, as mentioned, she's a very docile and lovable service cat that wouldn't be an issue whatsoever in a condo - hence the post. ????
A few messages in this thread mentioned pets in condos, but not "official", so I can respect why they may not have shared. Curious to hear more suggestions all the same, and for others in the same situ.
As a rule of thumb for those in the same scenario as me and my mother; it's best to call (plus visit if possible) and ask (as high up the food chain as you can with regards to ownership of the condo) because there are more "pet-friendly" places than the estate agents know of themselves. On the other hand, we've been told of serious fines and potential eviction if caught with a pet in condos that have strict policies.
So you'll have to use your judgement based on these variables. Best of luck!