Is this new coworker just a work friend or something more developing?

So it was even my bday and she was thoughtful and brought a cake and gave me a mini gift šŸŽ ( I only have known her for about 3 good months ) but so far she seems great person! we just kinda clicked and seem to get along super well and since to now go to breaks together and leave together and etc but we haven’t hung out yet with each other even tho I she has invited me for cup of coffee but it didn’t work out for me I have mentioned about hanging out again but suppose is sometimes busy what do y'all think she just a work friend?

Is this new coworker just a work friend or something more developing?
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