I agree you had a verbal agreement, She should of thought about all the 'if's" before she made the deal with you because in all reality if this is her 1st litter she could of very easily had just 1 pup weather it female or male.. and if it had been just a male you would of been on the other side of the deal "OUT". But luckily it fell out and she had a female so you get the girl.... and luckily she had 2 so she has profited. She got the bonus weather it female or male. REGARDLESS..... You should get the female. I think you learned a valuable lesson get it in WRITING and have a stud fee in case there is only 1 pup or not the pup of your choice. Good luck and let us know what's going on. I can't wait to see pictures of the little girl.
I know it stinks that we have to have contracts and things can't be the way it was way back when, when your word was the truth......