Hey there
Been talking to this girl for a few days straight. We have history.
Anyways, we're texting:

Me: Anyways, I'm gonna go take a shower
Her: Dirty
Me: Dirty is fun. But cleaning up is fun too.
Her: Sure, if you have company
Me: yaaa, that does sounds nice. It'd be a tight fit in my shower too.
Her: Are you hitting on me? Haha.
Me: Hahaha, is that considered hitting?
Her: Flirting, possibly.

Afterwards I took a few steps back. After further analysis, I figure the "Dirty" bit was a shit test to see if I'd bite on it. And I guess I wasn't the one to decide we escalate, bad business. The texting slowed down, and has halted for the night.
Just reporting stuff, I like writing it out, helps me think it over. Comments are encouraged.

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Let me rock my suspenders babe.

hmm... this is how i would have handled it...

Me: "anways im off to take a shower "
Her: "Dirty"
Me: "haha... yeh i totally am! i smell like man sweat! dont get smart or i'll put your face under my arm pit so you can smell man sweat!... hmmm actually wait... i wouldnt do that... you'd sooooo love it... wouldnt you you dirty little rat bag! haha "

basically it turns her shit test around by calling her dirty in a playful way...

from what i can see you just keep agreeing with her without turning her shit tests around... its ok to agree with it... but do it in a funny and playful way...

and for the "are you hitting on me?"

i probably would have said

"haha yeh totally! its because you're soooooooo my type haha :S"

it has a hint of sarcasm in it and kind of disqualifies her...

note that these work for my personality... they may or may not work for you but give them a go next time it happens

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A wise man once told me
"Bros before hoes, unless hoes have no clothes!"