I do.I have been in a couple of fights myself and i do have a martial arts background(very common in Brazil).Street fights involve no gloves,no mouth protection,you are usually wearing shoes/pants which make kicking complicated.You are also under concrete/asphalt which means you can slip and fall rather easily if you kick or get tripped.Female bones are smaller and more fragile than male bones.If Mike Tyson can break his hands in a street fight so can some a random MMA girl.Striking sucks for self defense.Period.If her take down game is bad her bjj wont work on a strong man with good sense of balance.Street fights usually happens in confined spaces too(buses-trains-elevators-small rooms),so you might not even have space to move and dodge punches.In a scenario like this her MMA game is useless:confined space,concrete floor,no gloves or mouth protection vs a big,strong man with good sense of balance.Average man size is usually around 1.75-1.80cm world wide.Average female size world wide is 1.60cm.Females have a huge disadvantage. The average female fighter is not Rounda Rousey(which has bad striking btw).