I’m not sure if I’m over reacting

Well last year I worked at a retail store for two months I meet a girl there we would only talk at work and occasionally outside of work we never hanged out but I really hated that job I cut ties with everyone after I left, well recently I came across one of our co workers who still keeps in contact with her well he asked me multiple times if I’ve talked to her since I proceeded to say no he gave me her number and I haven’t contacted her because if I’m being honest I didn’t want to well I see she requested me on Facebook and now I feel forced to talked to her which I msg her and she mentioned how she had just added me on Facebook to talk to me. I feel like she’s being a little pushy I only have Facebook for immediate family due to me not living in the same state and country as my family I just feel like she’s being pushy I’m not sure how to approach this. Since I haven’t talked to her in over 7 months I just casually ran into this old coworker and now she’s finding me.

I used to have a friend who used to be like this girl and honestly talking to her brings back those memories and I simply rather stay out of the drama, she has a lot of boy drama with this co worker and her boyfriend