Help! my 11y. o. cousin acts like Lolita with boys, what shall I do?

Anonymous
ok. my 11 y. o. cousin looks older then her age (+-13). also she likes guys and flirts with them. for me at 11 year is too early. she wants to dress like 15 yo and makes make up.
by accident i saw that she wrote to 13 y. o. guy: "i love you" on fb.
i was shocked, it's my first summer with her and dont know how to act, what to say.
it's summer... some guys hit on me (27) she even can make eyes to them :/
i'm worried, what shoud i do? how to explain it's wrong and why!
it looks so embarrassing sometiems, you have no idea! also im afraid that some bad guys can use her, she's so silly rn...
Help! my 11y. o. cousin acts like Lolita with boys, what shall I do?
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