She needs a couple balls to fill some gaps.  She has.  Looking for storm or roto grip.

Eternal Cell
Wrecker
Hyroad

typical house shot.  up the boards player.  turns the ball some not a ton.  up the back of the ball mostly.  speed around 13-14 mph.

The first question any Pro Shop should ask is what are you trying to get from the ball?  You say fill in some gaps, but that could mean anything.

What does she want to see?  Is the HyRoad/Wrecker too strong and does she need something weaker?  I have always thought those two were very close in performance.

Does she want something between the Eternal Cell and everything else?  Does she even use the Eternal Cell?

Once you know what a bowler wants/needs in their arsenal, the easier it is to select the right ball.  Too many bowlers just want something new.  And on the internet, we don't know anything about the conditions or your girlfriend.  Not trying to be difficult, but there are a lot of unknowns.

I would look at Storms new Matches -- solid and pearl --- Roto Grips new Wreck-it (hybrid) is also a smoother ball than the Wrecker, in other words it will not over react at the pin deck, it will pick up sooner and have more arch rather than a later reaction. Just depends what she wants.

You know I look at this site of a way of learning and getting some good advice but there always gotta be one or two people who gotta give a smart answer.  Those people make my day.  I needed a good laugh today.

Not looking to replace anything.  Right now her by road is her weakest ball.  Sometimes the wrecker and cell are too much and the hy road isnt enough.