I coach a lot of folks of varying levels and ages. What will mater most with respect to pin action is to match the ball weight properly. The entry level reactive balls do not have much of a weight block so, it is a minor consideration. The only thing that a reactive cover will do is to allow a bowler who throws a hook to increase the angle of entry into the pocket thus, increasing the chance for a strike. A straight ball hits the pocket and tends to deflect because of the entry angle. This is true regardless of the material that the cover is made of.
I would recommend the following:
1) Drill a conventional plastic ball.
Make sure that you use a good proshop in your area. Keep in mind that house balls typically feel heavier because they seldom have a good fit. One way to judge the proper weight is to have her stand with the ball on her fingers by her side. If she is able to stand for a minute or so without leaning that is generally a good sign. What we find in our shop is that women will typically end up in the 10-14lb range. Some who bowl a lot or who are competitive tournament bowlers will tend to be in the 14-15lb range. As an example, my 14 year old daughter who bowls regularly throws 14. She is not a big strong girl, pretty average in fact but, she bowls a lot and has built up muscle strength. I have another daughter who bowls NCAA in college and she throws 15lbs.
2) Find a USBC certified coach in your area.
This is not meant as a dig so, please don't take it that way. A certified coach has been trained and will typically have the experience to instruct her on proper technique. Many people who are decent bowlers often try to take matters into their own hands and find it frustrating trying to train someone. Also, what can happen is that bad technique is often communicated to the new bowler.
3) Find a mixed fun league to bowl with her in.
There are lots of leagues that are recreational in nature. I have found over the years that unless a bowler participates in a league, especially when they are new, they tend to drift away because it just isn't fun to bowl for practice once in a while.
4) Have fun and be patient.
Remember Rome was not built in a day. Regardless of what level any bowler takes the sport to, if it stops being fun we make it a job and so why are we doing it?
If you have any questions please feel free to PM me.
Fran