Soyla Bernice Gobert, 30, of San Diego, will be sentenced Feb. 25 after pleading guilty to committing two robberies at a La Jolla nail salon and two other holdups at another store hours earlier. Gobert faces a maximum term of eight years in state prison, according to court records. She held up Dan’s Nails & Spa, located at 8008 Girard Ave., at 6:30 p.m. on Oct. 16, but witnesses tackled her before she could get away.        Her attorney, Ian Pancer, has filed documents with San Diego Superior Court Judge Theodore Weathers that say she suffers from post-traumatic stress disorder from her service with the U.S. Navy in Iraq. The papers also say she has bipolar mental disorder and experienced her first manic episode in the Iraqi desert in 2003. Gobert was with the Navy for five years and was honorably discharged. She later worked at a Scripps Memorial Hospital for five years. She has no previous criminal record. A relative is now raising Gobert’s 14-year-old son. Pancer said he wants Gobert to enter a veterans’ program, and is seeking probation. She robbed two employees of the Coach department store in Chula Vista, and several hours later showed up at the La Jolla nail salon. She carried a fake gun during both holdups. She remains in the Las Colinas Detention Facility on $75,000 bail.