Giles and her friend, Hilda Marcela Cabrales-Arzola, were found dumped outside local hospitals.
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Toxicology reports show the women had multiple drugs in their systems.
David Pearce of Beverly Hills was charged in those deaths.
Sunday, in Alabama, Giles' family held a fundraiser so they can attend the trial here in Los Angeles.
"I'm just doing this, we're fighting on our daughter's behalf. We are doing something for her because it's the last thing, motheringly, that I can do for her is to make sure that these guys get justice and be there to support her and face them," said Leslie Giles.
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David Pearce has pleaded not guilty.
He is due back in court on May 26.