This might be a hot take but can Mrs.Flood just be Mrs.Flood who knows what a TARDIS is cause she lived in London all her life, where alien shit is happening at least once a year and is always accompanied by the doctor and a strange police box.
Yk the doc aren’t as subtle as they think they are, word gets around as to what the box actually is.
maybe mrs flood is just the dw equivalent of her ¯\_(ツ)_/¯














