True, but remember that Jill and MC are not a "thing" yet. At that stage of a pre-relationship, there has not been any trust that's been built up yet. If they were already officially an item, I would agree with you.
But I feel they are still at a stage where every little thing you do get's amplified 1000 times. And that is from both ends the MC and Jill. You are not sure if they really like you, so you try to read everything from anything. Body language, small rejections, big rejections, postings on social media.
She's taking a big step in a "potential" relationship. At best a rejection would be a big let down. At worst, self doubt and hurt would become very real for Jill.