There are some who have done this and it worked out well for them, but it is NOT recommended.
Don't ever assume that a well-respected escort with a good reputation is a safe bet. You'd be surprised how many of them would rip you off for a quick profit, even if it means trashing their reputations. At least two of the WG's in the Thieves section of the UKP blacklist have done this.
Even if she hasn't specifically asked you for money, she's probably preparing to scam you just by hinting that she's short of cash for an important purchase. DON'T fall for it.