She assumed that it was due to her clothing.
What is it about her clothing?
Because she often forgets to take care of herself so it is not exactly clean.
Not everyone has immediate access to laundry, you do not need to make fun of someone for that. It seems wrong to make fun like that.
It's gross.
I get that it is not the most cleanly practice, but I do not think that you should make fun of their clothing. It is hurtful and they are probably already aware of it.