She entered the room and shot him a glance... she was literally calling him inside. And if she really didn't want to start it, she would have made him leave. That's just her trying to remain prim and proper out of practice, since she is still not used to being sexual.
Pleeeeease, don't tell you really think she is NOT wanting to do him here. She literally give him the 'fuck me eyes' before entering, that is basically she telling him to ravage her.
It's Jill we are talking about, she is not as vocal with what she wants like other characters and the MC got used to reading her body and her actions. Plus he is way less pushy with this types of things with Jill than other characters, he would be jumping Sage and Bella as soon as they gave him the same look since he knew what it meant for example. Which is why he tested the waters before jumping to it.
And that's the problem with you people, it's not me giving her more credit than she is due, it's you guys giving her NO credit at all. I've had a similar discussion during episode 10 with someone because I said Jill instigated Trent to talk about Tybalt and that person was adamant that she was just making small talk and discovered it on acident.
She have this malice, she is still bad at flirting, but she still try to flirt with the MC and sure as heck, she was feeling good about herself after trying the new clothes and seeing that resembled her sister and was feeling adventurous so she "invited" the MC in... was she wanting sex? I don't know, maybe she just wanted to make out, but she sure as heck was also feeling horny since she didn't resist it either which means the thought crossed her mind and she was quickly to dismiss it.