I actually had my partner read this too, and we're in agreement, so you've got both a male and female opinion here lol:
SHE asked for your number, SHE wanted to spend more time with you. Seems awfully convenient that she wasn't able to do her work for whatever reason, and instead was content with just chit chatting. Also – hearts are flirty. Especially at work AND you just met the person.
We think she's interested but you probably didn't do enough during the hang out, and she didn't want to embarrass herself, so she just downplayed it.
Our advice is to just ask her out. She seems more forward, so she probably appreciates confidence. "Hey I had fun talking! We should get dinner some time. Are you available?"