Would she be charging you?

I can't say it would be any less - you can heal over distance - but I myself wouldn't feel comfortable with an attunement being done via Skype.

My suggestion would be maybe look around locally, see if there is a group that offers healing or an individual practitioner , and go from there? I think most of all you need to feel comfortable with the person attuning you, there is an exchange of energy between you.