Hello. Depending on how self-conscious your daughter is about her appearance, you may want to prepare her for the appearance of the treated area immediately after the procedure. She may have very dark bruising and as a young girl, may feel awkward while it is healing. The post procedure pictures can be a little daunting, but at her age it may help her to know what to expect. The good news is that it heals quickly and the PWS typically lightens dramatically. Our doctor gave us reassurance that if there is a lot of bruising, it will that much better once it has healed. A nine year old may have trouble with that, but pictures of others results may help her.
As far as the V Beam, it has given my son excellent results and he has tolerated it very well. His vocabulary is limited, he is only two. But he does not express much discomfort after his procedures.
Good luck to you and your daughter.