Toddlers fishy lumpy poo

[RedRobyn2021]

Sorry about the gross subject and title! Wasn't sure where else to ask but feeling worried

We flew to Majorca yesterday and today my daughter has been doing foul fishy smelling poo which looks lumpy and undigested. 3 of them.

Do you think I should be concerned?

She's eating normal and seems fine (except she's been refusing naps but that's not out of the ordinary 🙄)

I'm just worried she might be sick?

In one of my twins if the boy ate something when we were travelling (a pastry or x and chips in airport cafe for example) he quite often had smelly poo. Other child ate precisely the same food with no issues. It seems he has less tolerance of foods he doesn't normally consume. So, lots of fluids for your young lady and keep watch. If she is well and eating, I would not be too worried...but watch carefully as kids can rise and fall fast.

Thank you @DeliaOwens