If a girl acts childish only to me, is that some kind of flirting?

Anonymous
OK, so me and this girl we get along, we talk a lot and smile and we usually use sarcasm and make fun of each other. Sometimes if I make fun of her she will either tell me "ha ha, you are hilarious" (in a sarcastic tone) or repeat whatever I say to her in this kind of dumb sounding/goofy voice and I find it hilarious that we just keep talking like that lol. She is very mature, she is in her early 20 and I'm in my mid 20, but when we are together we act like little kids, just poking fun at each other, I know its not very mature, but its just how it plays out. We are our regular selves with other people, we just change when we are with each other. She is friendly and so am i, but when we talk we tend to do it like we don't like each other (in a playful way). I like her a lot, could she feel the same way?
If a girl acts childish only to me, is that some kind of flirting?
2 Opinion