Salma playing a 'spinster sister'!

I couldn't help bursting into laughter when the narrator said that Martha played the part of the spinster sister so well...while on the screen, Salma is decked out in a low-cut dress that fits like a second skin! It was too unbelievable. If Martha had really looked like that, she would not been reduced to murdering women for money. Men would've been throwing money at her! Casting Salma in this movie just totally blew all credibility out of the water.