Is this something to worry about?

My child is having huge poos! Her poops look like they came out of a ice cream machine. You know when is gonna be a bit one because she is having cramps in her stomach and butt pain. Is this dangerous? Is it serious? Should I worry about it?
Update: She eats crisp and chocolate. I can't get her to eat anything else she is 10 .
Update 2: I put it on a shelf and she steals it. I think she is stealing the step ladder. This has been happening for over a month
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