How did you know the kids are with MT? Does it say in the article? Sorry, I can't read Spanish.
Anyway, I don't think it's wrong for a mum to take a day out every now and then for herself, if she knows the kids will be well cared-for in her absence. In any case, it's a bit hard to say how many parties is too many parties - how would we put a number on something like that?
And how do we know really how many parties Tessy attends? I'm sure there are others here who have much better resources than I do
but "number of parties" is one of those things that can get inflated very quickly as gossip travels from person to person. There is also that matter of perception. Because party pictures make the news and cleaning up after the babies doesn't, it can sometimes appear that someone is spending a lot of time partying when actually it's only a night out every now and then.
And Tessy is still very young - not an excuse to be irresponsible, mind - but it shouldn't be too surprising if she does go out more than expected. As long as she's still spending sufficient time with her kids and being a good mum - that's what matters.