One word replys, what does it mean?

SO this girl and I kinda knew each other but not super well, but then our mutual friend got us hanging out more and we would facetime and stuff like that. then suddenly she's now out of the blue responding to my text with one word. I joked about wanting a burger and she just replied with "yum". I'm pretty sure our mutual friend isn't talking bad about me to her because it just doesn't seem like she would do that. but I know this girl is talking to our mutual friend a lot and not me. I don't feel left out or anything but our mutual friend hasn't reached out to me, but has to this girl and this girl isn't really responding to me like she normally does and I haven't even done anything. I asked for a screen recording of homework, but I doubt that would offend her.
One word replys, what does it mean?
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