It would still be best to try talking to her first even though you aren’t sure about when you will be able to engage in conversation with her.
She will not necessarily get creeped out if you add her randomly on social media.
However, she may just think that you are some random guy who is trying to get her attention and this is not a good place to be.
It is better to already have an impression in her mind before adding her to social media.
An impression would require that you actually talk to her first and build some rapport in the process.