Also, Mystery's one where you go "pick a number between 1 and 4" and with your hands you make hand gestures at "1" and "4" then click between them at around where "3" would be,,, then read her mind and say "3"..

Well don't just guess 3, pretend you have to actually "read" her to get the answer... Like, say, "just look up for a second",,, think,, then "can you look to the left,,, now right,,, back up again",,, ummm, is it 3

Then do the same with the "1 to 10" with the "7"... Make her look different directions or whatever, just something that looks like you have to analyze her to get the answer out of her head...


*****

Another way I thought of making this REALLY good is to
1. Do the 1 to 4 trick with her, guess it right - 3... Then write on a small bit of paper "3" in the top half... Show her, fold it up and put it in your pocket...
2. Do the trick again with 1 to 10, guessing 7... Take another small bit of paper out, write the 10 on the bottom half, take the 3 one out of your pocket, fold or screw them both up together... Then light them on fire or something, or put them into your "magic matchbox" or something like that...
3. Put the matchbox in your pocket, or the ash of the paper in your pocket and say, on the count of 3, these 2 peices of paper will be repaired and joined into 1 with both numbers on it... count to 3, then pull out a blank peice of paper... she's be like, oh, that's gay! then so oh wait, I think you shoudl check your handbag,,,, then when she does she'll find a peice of paper in their with 3 and 7 written on it!
which you of course, put their right at the start or even 10 minutes before doing the trick, because you knew she was going to say 3 & 7 already!...

I just made this up but if you can get creative you can change it around and make it really seem awesome..

Something that might add to it is not even guess the numbers right.... say "2", then when she says, no it's "3", be like, oh darn I got it wrong... But then write the 3 on the paper.... So the second half of the trick is still right where she finds the paper somewhere totally amazing without any way of you being able to put it there after learning her numbers...

Hope any of that makes sense...