“The challenge was to make it feel very violent without actually showing anything,” she said.
The BBC has faced criticism over other shows including Luther, with fans complaining that series five contained too much violence.
The second series of Fleabag, which continues on Monday night on BBC One, has received international acclaim.
Ms Waller-Bridge, the show’s co-creator, plays the central character – a sex-obsessed, dry-witted young woman navigating her way through life in London.
The actress said that when she was writing the character she was concerned about feminists wagging their fingers and whether she was doing it right.
She said that is was because “you’re not supposed to say” things that her character does, such as admitting she would trade five years of her life for the “perfect body”.
“A lot of women – and probably some men as well – feel like they could fall into a trap of being a bad feminist, which is somebody who doesn’t tick all the boxes of what it is to be a perfect feminist, or be a perfect spokeswoman for the cause,” Ms Waller-Bridge said.
“There are so many potholes in the road. It’s kind of frightening and you want to be able to say the right things.”