Question...I have a mom who has been nursing since she was like 21 and now shes like 29 and shes still nursing and it still says 240 mins. has anyone else had this problem?

You might want to read this conversation. That is common if you changed your system clock, among others.

It's also possible that she consumed something that turned her into a child earlier in her life. If that's the case, she will not wean her baby until she reaches the age she was before she became a child again. That's just a side effect of those Island Events.