When is someone playing hard to get?

I am in a situation now and my friends say this girl is playing a little hard to get. I don’t know what she wants to happen because of this game but it is genuinely the only reason i wasn’t sure if she liked me.

So this girl i am friends with for a while and i fell out of contact and she randomly hit me up at the start of this year and I haven’t seen her irl yet in a while so I don't know if we are even friends at this point. But she has been showing all the signs she is into me most days and then some days just full on ignores me while online.

My friend that is a little more experienced here says she is playing hard to get. So my question is: is she? And what are signs that someone is playing hard to get and isn’t just not interested

When is someone playing hard to get?
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