(Details below) Girl sends me private Snap of her in sports bra and leggings, captioned "liking the fit for the gym." Is she taking the initiative?

RichieB1tchy
So some important details:
-We've been flirting for about a month or so now. I'm 21M, she's 25F
-My cousin [F30] (our mutual friend) has said she doesn't want us to date, claiming she doesn't want to lose a friend. Cousin hasn't had a boyfriend in years, plays around with guys, wants a sidekick to go through it all with.
-Girl has told me I have pretty eyes, jokes with my parents and calls them her in-laws, sent me a picture of a bathing suit for her trip for my opinion, and now what the title says.
-She's established lots of physical contact, but some weeks she's all over me, some she doesn't seem very interested.
-Establishes serious physical contact, grabbing my hand, rubbing up against me, hugging me from behind, but then curls up on the couch with her butt towards me.
So while it's very obvious we're into each other, at least I think so, her physical signals are unclear and inconsistent and times. I think her sending me that Snap is sort of telling me she's going to go for me despite what her friend says. It's just every time I want to make a move, she's not as flirty as she usually is and I can't tell if I would make her uncomfortable. I'm very serious about her and she's said to a trusted mutual friend that I'm the "type of guy you marry, and take it slow with."

What's happening here, what do I do, and what is she trying to say?

Thanks!
(Details below) Girl sends me private Snap of her in sports bra and leggings, captioned "liking the fit for the gym." Is she taking the initiative?
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