No, your car may NOT be towed if you are parked legally, even if another person cannot access their car, whether because they are overweight, or handicapped, or simply parked too close to you (or have a car with those very striking looking, but wholly impractical, "gullwing" doors). If she tried to do anything like that, you could have sued her and whomever was helping her for all costs and damage and pressed criminal charges as well.