Did you text her back with positive reinforcement after she text ed you that day? She might have stopped testing you because she felt that she was putting herself out there too much, and you weren't showing any signs in return. Often when someone shows they really like you, after wards they realize they were too obvious, and try to compensate by being more aloof. The ball is in your court, so if you really like her, definitely go for it and ask her on a second date! You don't have that much to lose. If you like someone, show it, or you'll regret it later. Asking her on a second date is not being too pushy, as long as it's not the very next day. Good luck!