I agree it's a very random fall off. She may have backwards rationalized that the date wasn't as good as you thought it was, or maybe there is something personal going on behind the scenes.

Since you've already asked her about her schedule twice and triple texted, I'd give it another week and then send "I genuinely didn't take you for the flakey type." If she doesn't respond to that, take the hint and move on to the next.

It's all good. Don't pursue the kinky activities route anymore, it would be going from 0 to 100 and seem forced. Look for another opportunity later in a message or two to escalate or reframe.

There's nothing wrong with small talk, you just don't want too much of it. You're not her little texting buddy, you're the guy that's going to take charge and have her screaming from all of the orgasms you're giving her in bed.

Gotcha. The roleplay thing is cool, but if you don't show intent to actually meet up with her in person, it will die out very quick.

I'd reply with "You read my mind. Let's plan out the details over a bottle of wine/ over dinner sometime/ (insert date activity)."

When she complies with the soft close, tell her to shoot you her number. You'll have to use the transition from Hinge to text as a chance to actually build comfort, sexual tension, etc. to make sure she doesn't flake.

A date starting away from your place is fine. You've built up sexual chemistry with her already, so make sure that throughout the date you build sexual tension so that at the end of the night she's willing to go back with you. She's already turned on by you, she's just nervous because of past experiences. Make her comfortable and she's yours.

"Come get a better look at me in person and maybe we can figure it out."

"Sounds like it's time for me to come rescue you."

Go for the soft close

"Perfect. Do you like (insert activity)?"

"Lets discuss it together over a bottle of wine"

Definitely talk about the kinky activities. If you focus on the more platonic activities, you will set a platonic frame for the rest of the conversation. If she doesn't respond to the kinky activities, follow up with "Or were you asking about to my less fun hobbies"

This is a good amount of banter and she's receptive. Go for the soft close and move to text.