Our teens text CONSTANTLY. It's the new normal.
In my opinion, if they are doing well in the important areas of their life, let them text as much as they want. They all do it. Just get an unlimited texting plan or you are in for a whopper of a phone bill.
Reading other posts: Why does everyone think texting is so bad? 40 years ago, parents thought rock and roll was bad. Things change. It's just their way of communicating with each other. When we were teens, we spent hours on the phone. Texting replaces the phone.
If some of you moms don't lighten up, you are in for a lot of battles.
However, you can use taking away texting as leverage to get her to do better in school, as you are doing.