But plugs are fun, but you need a chat with her before buying one as not everyone is into them.
If the bullet is battery powered, getting a rechargable one might be a nice idea. Massive power difference between a battery and chargeable. Desire bullet is a very solid pick if you want a suggestion. If she likes toys Strong and rumbly it is a very good choice.
Mantric is also a nice bullet and the whole range is very popular.
Remote or app toys are alot of fun for couples.
You can get all sorts incuding love eggs, knicker vibes, rabbits, wands, suction toys etc.
If she loves her rabbit, you could upgrade it. There are quite a few different types on here. Some of the thrust or stroke your g spot as well as vibrate. The g spot stroking one is very popular on the forum.
I keep drooling over this, kind of like an all rounder, has very good reviews. 
fills the “new and exciting” box maybe?
Glass is also fun if youd think she’d like it. The Tracy cox set and the beaded glass dildo are very poular.
I really liked this for firm g spotting. I think Its a good alternative to the njoy pure wand if you dont want to spend £120 (although that thing gets rave reviews so is obviously worth the pennies)
Hopefully thats given you some ideas.
Apart from a toy you can use during sex (sorry not an expert on those) cant think of anyhing else of the top of my head 