Squee she's adorable! You would probably want to get her trimmed anyway in your climate, which will make things easier around the bumhole area. When my little fluffball was a kitten she had poo stuck around her bum and I freaked a bit and sat her in the bathroom on an old towel for 15 minutes and bingo she cleaned it all herself.
I've only ever fed mine Science Diet dry food from day 1 - kitten food for the first year then adult after that. It's more expensive but it keeps their poo reasonably firm and it could save me thousands in vet bills down the track because they're less likely to have kidney or other organ problems later on. It's got everything they need (other than a bit of cat grass every now and then) and they're both super healthy.