I'm not sure there have been many - or any - cases where trans-identified females have freaked other women out in the women's toilets. The trans activists are desperately trying to get women to riot because apparently men are using women's facilities, and this will supposedly show how "impractical" it is to have people use facilities according to their biological sex, but transmen just don't convince as men.
All the trans-identified females I've met, who have had some kind of surgery/pharmaceuticals, are very short for men (they're not often the tall as women either), have bum fluff on their faces, have wide hips and a trembly, froggy voice. They tend to wear baggy clothes. They really aren't very masculine and don't look scary at all, just sad.
The solutions are simple anyway, so I'm not sure why some people are in a quandary over this. Depending on jurisdiction, in Kansas they have to use the loos according to their sex, i.e. the women's loos. In the UK, they can use the women's loos or the unisex loos, if they are available. I really doubt any woman is going to be traumatised by seeing one in the women's loos.