If the Twist didn't work, the Hustle isn't going to be any better. In the 11lb weight, neither the Twist nor the Hustle have a weight block.
My senior Mom tried a Roto Grip MVP Pearl in 12lb. It had a very basic bulb core, but not very dynamic. She found that it just wouldn't carry. It would go into the pocket, but just didn't have enough drive to carry.
If you want a dynamic 11lb ball, there is currently an 11lb Ebonite Turbo/R on eBay. It has dynamics that are way better than a Hustle.
https://www.ebay.com/itm/354622581458It's an X-out due to being 11lb 8oz, but drilling will remove a few ounces. Might be worth a try if she can't throw 12lb.