She's not ever going to be your best friend and it's certainly not going to be a romance, but OK. I'm saying that as someone who has lots of SAs/SMs who are actually my friends.
Personally, I wouldn't save anything 'for later', there's no later with these brands, they can discontinue anything any minute (learned my lessens). That's a different topic.
Most people like celebrities because they're dazzled and impressed by them, not coz they hang out. Every transaction with an SA is a financial one. Maintaining a relationship is fine, but that's when you already have a collection. If you want a bag, go big, don't get on her nerves taking-up all her time, just spend.
Anyway, you do it your way.