If a woman gives me her KakaoTalk profile picture, does it mean she's interested?

I'm a 25-year-old male civil servant. An older acquaintance introduced me to a woman three years older than me. He sent her my photo, and after some thought, she sent me her KakaoTalk profile through him. She said it's okay if I contact her, but I'm worried because I'm not sure how she truly feels... I haven't really dated older women before, so I don't know what to expect. She is pretty, so do you think it would be okay to at least ask her out for a meal?