1. Be honest and tell her you're not ready for a relationship yet with anyone but really like her and would like to see where it would go.
Its best to be honest from the start and possibly not go anywhere than screw her about and then end up it getting nasty latter on and ending up destroying her or having a stalker.
You never know, as she's just coming out of a divorce, she might not be after anything but a casual experience!

2. Hows your day going?/Any plans for the weekend?/Fancy a shag in the stationary cupboard?/We are thinking of going for a drink after work, do you wanna come?