The cover of the tropical storm is reasonably strong, but the weightblock isn't much to speak of.
Usually, women with weaker releases and slower speedshave a hard time using higher end equipment due to the fact that higher end stuff tends to use more energy than that type of release puts into the ball. I can't tell you how many times I see women using balls picked out by their significant other because it works for them and they just expect it to work for their wife/girlfriend the same way, and it just doesn't.
If she isn't having any trouble with the tropical, i would stay with something in that performance level, or maybe just a bit above. Balls with a lower RG number are going to be a bit more predictable, but also start their motions earlier.
I would definitely stay with a pearlized cover. The pearl cover will, generally, help the ball conserve the energy longer, but can make it a bit touchier at the breakpoint. That fact may be offset by her slower ballspeed.
The cherry vibe is a very good piece, and stronger than advertised. Many competitive bowlers have one of these in their bag for use when the heads break down and their aggressive ball starts to read the lanes too early.
The avalanche pearl is designed to be a ball of this type also. Good pearlized coverstock with a milder flaring weightblock.
Given what we have just discussed, I want to say that visionary makes a very good ball along these same lines, but it is not a pearl. The visionary blue/green centaur has the mildest solid coverstock and a very mild core and is what I use for burned out shots. It is very control oriented and as good as anything else out there. Just last thursday, when my polished PAIN was burning up in the heads, I used my B/G centaur at 1000 grit and had to move 5 right, it is that mild.
There are MANY good choices. Good luck with your quest.
--------------------
What did you expect, something PROFOUND?
Good transactions list in my profile
My Bowl.com member page