Personally, my daughter is an honor student and is in the process of the final stages of publishing her own fantasy book at the age of 18. She sends text messages often throughout the day to me with all the text lingo, abreviations, minus the proper punctuation. She may have rebelled, ignored me or simply stop texting if I got her to send text's me in full sentence structure.
Certainly has not hurt her English language ability & talents. JMHO.
I'm the 'Don't Sweat the Small Stuff" kinda mom. If text lingo is the "in thing", that's perfectly fine by me. I'll go with any methods to always keep the communication door open with my teens.
This poor sweet girl, if she only knew in a matter of months, these people would be but a distant pathetic memory that has no bearing on her real life.
My daughter brought a paper home she wrote at school, it was full of abreviations and text lingo. That's when I made her start spelling everything out in her text. Your daughter may have been one of the lucky one's. My kids are too addicted to stop texting.