I got a girl's number on Tinder. We haven't talked much, but I texted her "Hey, it's EscapedTheMatrix, you free today?" And she responded with "Not today, sorry"

Should I Next her or is there a proper response to this?

She seemed fairly interested from the two or three texts we sent on Tinder before I got her number. She's also high school age and it's a Tuesday in September, so she probably has a good reason.

What do I do, fellow RPers? I'm willing to Next her but there's no point in doing so if I can take it further.

EDIT: Following the advice of AberdeenRSK and trpftw. Soft nexting for now, but not ruling out the possibility of something happening. I won't text her back today, but when I do, it will be with specific plans for the weekend.