I wouldn’t assume that. Some cats just develop fears for no obvious reason. Our 7 year old female cat flees at any sudden noise or movement. She runs and hides any time we have visitors. My sister in law has come to pet sit for her several times but she hisses at her if she tries to get too close. We adopted her as a kitten from a friend who had taken in a pregnant stray. She has never been mistreated or experienced any sort of trauma and was actually pretty normal as a kitten. These behaviors didn’t start manifesting until she was about a year old. As far as we can tell she just has anxiety issues.