Texturizer are relaxers but texturize sounds better than relaxer cause some parents dont likehe idea of "relaxing" their childs hair.
Since it is a relaxer u need to adopt a reggie for relaxed hair, I would do some searches on here to find relaxed haeads that I admire and try their reggies out on her for a while.
If u intend to keep relaxing her hair hereis what I suggest, I would switch her to lye first off cause no lye box relaxers tend to severly thin the hair out overtime. I also woulnt relax her again until I got the breakage undercontrol. Forthe breakage, I would get a hardcore protein like Dudleys DRC-28 and use that on her every 6 weeks or so following up with a moisturizing conditioner. I would also invest in some porosity control to use the wash b4 and after her relaxer. Other than that, I would protective style the heck out of her hair. I dont think extention braids and relaxers mix so maybe a bun for a while? And no heat at all
Whatever u decide to do,good luck!