GA....you know I have you back on this but just some cautions from my experience over the years. Make sure you evaluate that your girl is putting the same into tennis that you are. For example, you are obviously putting a lot of your income into tennis. You could instead have taken her to $50/hour lessons and bought yourself that convertible 68 Mustang you wanted when you got older. You are putting her tennis above your own wants.
Is she reciprocating? By that I mean does she watch tennis channel with an obsession or Icarly instead? Do you see her outside on the Bozu getting some extra work in on her own because some girl at tennis training was a tad more balanced than she was? Does she bring up tennis at dinner to the point it annoys mom?
Kids are sponges. If they see the parent obsessing that the strings have to be perfect, the coach has to be the best, the hotel for the tournaments has to be perfect, they begin to focus on the things and not the process. That can be limiting long term and lead to excuse making.
I would rather bet on the kid with not so perfect strokes, who hits in the hot sun for 2 hours on the wall while pretending to be winning the US Open in her mind....then the kid with the fancy coached strokes who does not even mention tennis until the next time they have to go to a lesson or tournament.
All I suggest is that you monitor the situation and make sure the sacrifice and tennis obsession is mutual.