Sansevieria do not like to be overwatered, especially when in low light. Right now, your plant has barely enough light to stay alive it looks like. It probably doesn't need watering very often at all. Eventually, they can fall apart if they get very little light for a long period of time. It may only need watering about once a month if that location is as dim as it looks and may only need enough water to wet the soil down three or four inches. I have a laurentii (like yours) in my bathroom on the floor. Although there is a large west window that lets in a lot of afternoon light, the plant is probably 8 feet from the window so I consider it low light and only water it when the pot is completely dry (I also repotted it into terra cotta that allows more air flow to help dry it out and not let it stay wet so long). It is surviving, but I would hardly say it's thriving since it hasn't put on any new growth. It hasn't lost any either so I guess that's something.. I feel sorry for it sometimes, but have no other spot to move it to at the moment.