Haha...
First of all, I am no relationship expert, otherwise I would be
too busy with a harem to be here. Only posting to share a
thought.
Usually, girls are more matured than guys, and she probably is
more aware of her priorities, such as studies/work, projects, all
matters related to education/career.
That she is telling you to take it slow is to let you know where
you stand, and hopefully, you will accept and respect her views and
remain friends, which I am sure she will treasure in time to come
and if you are sincere and you really love her, her feelings for
you may grow.
But if it doesnt, then know that love cannot be forced or grow
in the shortest time. I am sure you still have a whole life
ahead of you to find and experience what life can offer
you.
In summary, dont attempt to possess her, make her your steady
and disallow other guys near her. Love is not about possession.
Love grows from sincere and genuine concerns by friendships, and it
will be returned in kind if the feeling is mutual. Focus and help
yourself in your studies/job and help her too.
Good luck!