I wanted to get a girl I have seen a gift. I saw her for a minimal amount of time before, but it has been in my head ever since. How much is a reasonable amount to spend on a gift?

Well I think it depends on your financial ability and whether or not you think she deserved much more than she asked for. Also depends on her rates somewhat. A $1,500hr girl is going to be used to high end gifts and may have a wish list. A lower rate provider may appreciate a cash gift more. I actually usually get a gift to bring along before seeing a provider. I used to bring chocolate covered strawberries but some don't want to break their diet so I hit on the idea of Lingerie which works wonders as they feel sexy and I get to pick what I'd like to see them in.
Actually one provider in Vegas sent me a very nice gift after our last meeting. Thanks Gina