I am looking for a ball for my daughter for when the pattern gets toasted after several games bowled. She is a lower rev bowler, avg speed 14-15mph, and typically shoots from the 17 to 10 on the THS. I am hoping to find her something that can handle the medium-dry patterns. She currently uses a 15lb Pure Swing as her got to ball and follows that with her 15lb VG, but both of these balls burn a lot of energy on the drier patterns that she has experienced. Any advice??

Are you talking the hybrid version? I don't believe I want her throwing pearl and it snapping to hard.

So you believe the Natural Pearl would be good? So I guess my question is....since it is a pearl it doesn't snap in the end like typical pearls do?

The Brunswick Slingshot would be an excellent choice.

 

Not at all...very tame but smooth reaction. That's because it's a pearl -urethane- , not a pearl -reactive-. Good Luck.
 

So what do you all think about the Tropical Heat Hybrid? Too strong maybe?

 

As I said before, stepping down from the Virtual Gravity leaves a heck of a lot of options.  Just make sure that the ball she picks matches the conditions she'll be facing.  If the lanes truly are toasty, then a hybrid might be too strong...or it might be perfect.  It's a really tough call.  
My goal when switching balls is to maintain a similar look to the look I had with the previous ball...unless, of course, a big move is called for by the conditions.  I'm presuming your daughter wants to do the same thing, that's why I'll stick by my recommendation of a weaker solid rather than a pearl, hybrid, or urethane.  She should be able to play a similar line with a similar look when her VG starts over-reacting or burning up.

I'm with leftyinsnellville and sport300 on this.  From a Pure Swing and Virtual Gravity your daughter definitely would NOT need something like a Natural.  I might even be inclined to say the Slingshots and Reactive Tropical might still be too weak. 

Just going by her current ball choices and general speed and line, I'd have to suggest something in the lower Mid-Range area.  Vibe Series, Brawl probably would work fine even, Hard Ball/Curve Ball from Ebonite, Freeze line from Columbia, Fast/Furious Line from Storm. 

 

Without seeing her bowl it's tough to narrow it down to a company that her ball roll works best with, but that would be the range of bowling balls I would suggest to consider.