Unfortunately, flu incubates about 1-4 days before showing symptoms and you can be infectious while asymptomatic a day or so prior to developing symptoms of your own. So there is definitely a risk.
At least a half dozen people have died in the Chicago area already this season, and the hospital I work for requires all employees with patient contact to be vaccinated; those with medical conditions preventing them from being safely vaccinated have to wear masks when with a patient, regardless of whether either of them is showing symptoms. This is being taken seriously.
Missed the edit: I wrote with the assumption that no one was vaccinated, as I figured that would have been an important thing to mention.
Did she get vaccinated this year? Did your toddler?
If so the risk of contagiousness in her to your toddler without her having any symptoms is so small as to be not worth considering. You have more risk going to the grocery store.
I’m 99.9% certain that I read somewhere that it did. In fact, I think I read it here. I’ll see if I can dig something up if somebody doesn’t beat me to it. I’ll try the CDC’s main page first.