ok.. she's upper management.. ambitious -likes to take risks- dominating, manipulative, -wants to crack 100K before she's 30-
your basic average class A personality in a size six..
the devil in prada.
So, present her with something scarier than she is..
..marriage and as many kids as soon as possible.
I'll bet TESFanner's 'nads she drops you like dead weight.
-
because I'm obviously not betting my own here 
Okay, then how to proceed..
Take her to lunch, make it a quiet -but not too quiet- place, you don't want her thinking it's bowchickabowbow time
(thx for that one, Emz.. lmao)..a park bench is good.
Bring donuts.. dunno why but I'm on a diet so humor me, m'kay?
Then at some point simply ask her where she thinks this relationship with you is going. Let her do the talking after that, and once she's done go with the marriage and kids..
or..You can ask her whether your happiness is at any point relevant in this relationship in any equal proportion with her happiness..
..and if/when she says yes,
Let her know that you aren't (happy). And even if she doesn't want to see it now, soon it'll grow into a heaving bitter resentment towards her and eventually you won't care about her feelings, your job or anything anymore. And dump her by posting six videos on the company server..
Then having to quit it'll then undoubtedly drive you to burning her career, social life, facebook profile and whatever else you can think of. And say this with a deadpan face.
or..tell her -flat out- that it's her actions that are dampening your happiness currently. That her idea of 'zany' is your idea of a custom tailored straight jacket and weekend visitations, -meds permitting- and that she either has to seriously take it down a notch -or three- or let you -and her- get on with your lives, and hopefully both find someone that 'fits'.
She might go bat [censored] crazy on you for a spell.. let her rant and threaten.
Once she calms down somewhat, take out your phone -push and arbitrary button, but make a show of doing so(*)- and tell her you recorded the whole conversation and will mail it to her boss is she even thinks of harassing you.
(*) or you can actually record the conversation..okay, that's all the [censored] dear abby I got in me for one evening.. now I want a beer.