What would cause a girl I'm texting to grow an abnormally large belly?

I met this girl when I was out on a run once and I thought she was really cute so I asked her for her number. She’s pretty average when it comes to height and weight. She must have been wearing baggy clothes the first time I met her because after seeing her a couple of times afterwards I noticed that she has a larger than normal abdomen. Since she’s wearing tighter clothes now I noticed that everywhere else around her body she is somewhat skinny.

When she stands up her belly kind of hangs over her pants. All I know as of now is that she has a kid that she spends time with on the weekend. I don’t know if there’s some type of alcoholism involved or not. We’ve just been talking for about 2 weeks. That’s just something that has me a little concerned but it does not deter me. I still find her cute and still want to get to know her.

What would cause this in someone relatively young?

What would cause a girl I'm texting to grow an abnormally large belly?
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