She said yes to a date but sounded reluctant. What does this mean?

Intangible
Backstory:

I met a girl in college and there was initial smiles and chemistry. She seemed a bit shy in the following weeks when I talked to her and never got a chance to get to know her. She left college early because of money and family problems. Months later, after she left, she gave her number to a college friend for me when I asked for it. I phoned her today and had a brief but nice catchup then asked her out. She seemed reluctant but said yes and then wouldn't set a specific day. She said she'd text me next week when she gets her hours for work.

What does this mean? I ask because there was initial chemistry, albeit months ago, she gave her number knowing I was going to ask her out, she talked to a girl in college, when I only tried to get her email.

I got a yes but I didn't feel good about how she sounded like it was some kind of inconvenience.
One part of me thinks it could be shyness or nerves the other feels rejected somehow. Confused!

Any insight would be appreciated, thanks
She said yes to a date but sounded reluctant. What does this mean?
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