I have a little girl adopted internationally, and we dealt with the same speech issues. It ended up that she has apraxia. Apraxia is a processing issue that affects their ability to read and write as well. She is in intensive speech therapy, but we've had lots of success with SING, SPELL, READ, AND WRITE. They have a preschool kit. They teach phonics through songs and games. Its worked very well, but due to the apraxia we have to do lots of systematac review over things we've already mastered.

To encourage you, my daughter is 7 and is exceeding their expectations. But her learning pace is much slower than my other child's. And that's okay; we homeschool to accommodate our kid's needs We also use Handwriting without Tears to help with that.

Hope this helps.
AnnM in Texas