One of the balls that is gonna be just little more aggresive and not that much more is a Columbia Flipside Wild......it doesn't really have that aggresive of a core but it has a more aggresive coverstock.....and it would work really well....and maybe if you wanted to you could let her stay with a 12 and go up to the Nemesis....it it a aggressive ball that should keep deflection down to a minimum and let her ball drive just alittle more......

The brunswick nemisis isn't really a med-light ball, unless I've gone insane.

What kind of reaction does she want?  The flash point would be very good if she wants a controllable, even ball.  So that's my suggestion.
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ANDY
There is doing in not doing what you weren't doing but doing in what you weren't doing to do what you were doing but not doing and doing as well

So don't do it!

shes pretty much a down and in bowler. nice easy arc to the pocket. the Groove has a decent block, I think the low weight is the problem. but maybe a more aggresive core will help too.
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Insert clever phrase here.......

Well the Nemesis is a stronger ball.....and the core is stronger too.....which will get the ball in a earlier yet controllable roll.....the reason for deflection is somewhat weight.....but not as much as angle of entry and hook potential.....and also it will probably take about 1-3 months before she settles into a heavier weight.....so look at more aggressive balls in the 12# range instead of going up in weight......

that's why I figure a 14# will have a good core, the 12 has the same as the other grooves, but something more aggresive I think will carry better, plus the increase in weight.
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Insert clever phrase here.......