What do girls mean when they use XOXOXO?

My online friend and I are very close and increasingly comfortable talking about personal topics.
She recently sent me a gift with a little note that ended in XOXOXO.
I'd never seen her use that before when talking to me or anyone else
Is this something girls say to their close friends or am I just overthinking it?

What do girls mean when they use XOXOXO?
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