What does it mean when a girl uses smiley emojicons in her text messages?

Ok so there's this girl i'm friends with (she's my younger sisters friend, that's how I know her). We don't text each other a lot (probably only once a week, sometimes not even). But when she does text me, she always sends lots of smiley emojions (the smiley picture things on the iphone). Sometimes she will send regular smileys like this: ":)", but it's usually emojis. What is she trying to say with all these emojis? Like last night, we hung out just the two of us for the first time ever for like 2 hours (just to the mall then ice cream) and when I got home, I just texted her saying "had funn tonight thanks for coming", and she replied with stuff like "samee had so much fun, thank you" with emojis after that (once in a while. Faces). Does this mean she's into me? I've always thought she might have but never knew. By the way, I'm 19, she's 16 almost 17

She also puts extra letters and the end of wordsss likee thiss

Not concerned about it seeing how I like her anyway, just sayin

I don't know, I don't think it really means anything. Most girls use the smiley face emoji with everyone, people I know at least. I don't think it really means much though, sorry.