My 14 yr

My 14 yr old daughter has had fixed braces for 4 years to correct an overbite and jutting out front teeth.I am very concerned that very large gaps started appearing in her teeth last year and are becoming progressively worse.She also was advised to have 2 back teeth extracted by her orthodontist.She is acutely conscious of this and I am finding it difficult to placate her.I know her treatment is still in progress but the gaps look so large it’s hard to believe they will be able to be closed properly.Is it possible she will be left with these gaps?