Is she loosing interest or just busy?

I've matched with this girl on Tinder, and we hit it off right away. I ask her out on a date, she agrees and suggests we move the conversation to IM. We both have fun meeting and talking in person, up to the point that we already know that we are going to meet for a second date.

Few days pass, the conversation flows nicely, we exchange a few messages daily. I schedule the second date, this time at my place (we talked about how I like cooking and she was curious to taste some, so I took that chance), she gladly agrees. We have a good time, she could not stay till late, but we kissed and there was some physical contact (not sexual, but that kind of lightly touching and brushing that makes you understand there is some sort of attraction). When we kissed I didn't feel like she wanted to move things forward, so after a few kisses I suggested we eat and everything is ok. When it's time for her to go, we kiss once more.

After that, the conversation over text kind of slows down. We briefly talk the following day, and the day after that, but then it halts for a couple of days. She resumes the conversation with a flattering comment on my new profile picture, so I thank her for that and ask her if she's up to meet once again. She says yes, but adds that this week is going to be busy and we would have to find some common free time. I agree to that, and ask for her availability. This was two days ago, she has read the message but still hasn't replied.

I understand that she is busy, and may even date other people (something I am doing too), and that's ok. Still, this change in communication makes me wonder if her interest is fading, or is just a matter of her schedule. I am not going to pressure her in any way, but it would be a bummer because I genuinely enjoyed these two evenings with her.
Have you ever been in this situation? On one side she has stated her interest multiple times, on the other she's been less responsive lately so that makes me wonder about her intentions.
Is she loosing interest or just busy?
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