All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
Your question stems from whispers and it proves that you are affected by them, so you must ignore them and not pay any attention to them.
If the water with which your mother had washed the impurity –if we presume that there is any impurity –is separated from the impurity without being changed by it, then it is ruled that it [the water] is pure.
Hence, the water that fell on the floor of the bathroom is pure and whatever it has touched is also pure.
We conclude with the advice we have started that in this Fatwa, that you have to repel and ignore these whispers, and that you do not judge that something is impure or that the impurity is transferred from one object to another unless you are absolutely certain about that.
For more benefit, please refer to Fataawa 358717, 377887, 370942, 375406 and 386329.
Allah knows best.