Why do girls sometimes add extra letters at the end of words. is it flirting?

Anonymous
for example, she'd go "thanksss" it's not something she normally does. she did it after I wished her merry Christmas a few months ago. ( of course she didn't just write thanksss but it was part of the message) is it considered flirting? why the three s's?
Why do girls sometimes add extra letters at the end of words. is it flirting?
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