Question says it all, but I've been talking to a girl and she told me she'd be really busy this weekend. She hasn't replied to me since Friday and I don't want to seem needy and text her again. But if a girl actually likes you, she'd take 5 secs to text you right?
Some people are genuinely busy to text back right away. Obviously if they take days to message back, and this is consistent... then it's a sign of disinterest. She has told you she is busy this weekend, so just believe her, unless she starts to be too busy all of the time.
If she told you ahead of time she was going to be busy, it's the truth. The best solution is to keep yourself busy too. If she's responding hours later with tiny sentences and tells you she's busy when you ask, that's an excuse. She isn't into it. Treat her the exact way she treats you and let whatever happens happen (and, obviously, talk to her when you see her. that's where chemistry happens.)
Nope, not really. Depending on her schedule she could actually be busy with something important and you're a distraction that'd keep her from getting it done/paying attention to what she's doing. I'd text her when the weekend is over and ask her how things went. This shows that you respect her time/the fact that she's busy, and you care about what happens during that time.