Why did she call me, "boo boo"? What does boo boo mean?

Sunbather9
Hey everyone. So I'm talking to this girl I like who has recently been in an accident and lost her job for it. I told her I was glad she wasn't hurt and gave her some encouraging words to hang in there. Then she responds by saying, "Thank you boo boo, I'm actually glad I left that hell." (the company). Now I know what "boo" means in a girlfriend/boyfriend relationship, but what does "boo boo" mean? Is she quietly calling me "boo" but double the meaning? Is she being flirty or friendly? If you can tell, I don't know everyone "slang" word out there. Please help. Thank you.
Why did she call me, "boo boo"? What does boo boo mean?
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