According to a lawsuit filed in L.A. County Superior Court, Luiza Boyadjian claims she went to Eva's eatery last year to "celebrate her birthday with friends and family."

Boyadjian claims she tried to get up from her chair and walk around, when she "suddenly slipped and fell due to the floor ... being extremely slippery."

Boyadjian claims she's suffered major physical injuries as a result of the fall -- including damage to her nervous system.

Boyadjian alleges the restaurant had a duty to maintain safer floors -- and she's suing for unspecified damages greater than $25,000.