Thank you for your question. It really depends on the type of contacts that she wears and although some people may be able to wear contacts all their lives, others may not. Here is a link in regard to highly oxygen permeable contacts http://abstracts.iovs.org/cgi/content/abstract/43/12/1657.
The above link provides information about the long term effects of this kind of contact and the possibility of effects to the cornea.
Using hard contacts can certainly be detrimental to your vision as well as you can see in this article from Ehow.com http://www.ehow.com/facts_5525225_effects-wearing-hard-contact-lenses.html.
To be more specific, what kind of contacts do you wear so we can help you better understand the contacts specific to your use?