What does it mean when a girl says OMG and ends the conversation there?

Greateye

Was that a reaction of them being surprised, shy and/or flustered?

Is this a shy girl reaction?

Context:

I've known this girl for 2 years. We don't see each other that much during the months (it's like 5 or 6 minutes and it's like twice per week).

Whenever I tell them something that's like a compliment for them, they seem to get shocked, surprised and laugh a little (more like a giggle).

It kind of goes like the following:

Me: Hey

Her: Hey

Me: How are you?

Her: Good and you?

Me: Good

Her: Good to know

Me:Nice, have you seen *mentions about the series*

Her: Oh yeah, *mentions about the series*

After that little conversation ends

Me: Hey, did you started to take modeling photo sessions?

Her: OMG, *giggles* (or makes a little laugh). *stays a little speechless*. Byeeee

Then she leaves

The following day, we keep on talking like we usually do.

What does it mean when a girl says OMG and ends the conversation there?
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