It really depends on how comfortable you and your friend are with these kinds of things. If you've talked about toys or know that she uses them then I would think it'd be ok.
I'd probably stick to something a little more elegant and abstract like a We-vibe or JimmyJane toy.
To be a little safer you could always make a little basket with massage oil, bath stuff, candles and a little handheld massager. That way it's not specifically a sex toy.