If the tank is cycled then a nitrite test shouldn't really be needed.
I woudl suggest getting her some nice gloves to wear, like dishwashing gloves. Keep them as aquarium only. That way she can put her hands in the tank if she has to without any worries.
I woudl suggest getting her some nice gloves to wear, like dishwashing gloves. Keep them as aquarium only. That way she can put her hands in the tank if she has to without any worries.