Why would a friend react like this?

So me and a friend (girl) were having a conversation and she says that she's about to plan her honeymoon right now. So respectfully I said I'll leave the convo to get on with that. So she replies..

"Yes you do that xD I'm enjoying it"
"I'm very lucky to be loved"

I replied jokingly:
"well then you should get on with it without distraction ha" this was immediately read by her (whoops 🤭😂)

She replied: "no need to be snappy o. O I'll leave you be!"

I wasn't being snappy tho so I said:
"no no, just cheeky"

Why is this girl behaving in a strange way? I don't get it
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Update: I told her why I had to leave the convo, she came back and said she's stressed as everyone keeps giving her opinions on her wedding (I thought she was planning her honeymoon?) and she's going to now sit with her fiance to think it through because she wants a tiny wedding. And she hoped my issue was fixed (that's nice of her to say^^). So anyway thanks to all of you for your opinions, I just told her that it's difficult knowing her state of mind when she messages me.
Why would a friend react like this?
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