She has been single for 8 year but had no sex for ten years before we met (or so she tells me)
It could be that her relationship with you has caused her self-confidence to rise to forgotten heights and she may be, not so much making up for lost time, as revelling in a new found sense of empowerment and the somewhat giddy feeling of excitement this can engender.
Your relationship appears to have gone at a rapid pace and you've moved into her home before she's divorced. Is there a divorce in progress? If not, you should be aware that her husband could divorce her for adultery and cite you as co-respondent.
I'm not saying this will happen or that it would necessarily be a bad thing if it does but, if you haven't given any consideration to the fact that you may find yourself liable for a portion of the courts costs of her divorce, I would question how well thought out your decision to move in with her has been.
She often says that her friend is a bad influence on her I'd be wary of anyone who makes a statement such as this as it implies they have no will, or will-power, of their own and that they may seek to excuse unacceptable behaviour by blaming someone else for their preventable excesses.
It seems to come down to the fact that you don't trust your 'current partner' and, as Happybunny has said, you shouldn't be harbouring these doubts during the honeymoon phase of this hitherto short-lived liaison.
As open and honest communication is key to a harmonious relationship, I suggest you put your cards on table with a view to ascertaining whether her boundary lines are in accordance with yours and cut your losses if they're not.