A cat may be fearful of your girlfriend for many reasons. One possible reason is that the cat has had some bad experiences in the past, such as being fed inappropriate food or being abused, so it may be wary of strangers. Another possible reason is that the cat may be a very sensitive animal. It may be affected by some sounds, smells or body language, causing it to be afraid of a certain person. If your girlfriend wants to develop a good relationship with your cat, suggest that she interact with the cat patiently and try not to scare it. She can first let the cat approach her, and then gently pet the cat's head.
If the cat responds to her, she can continue to pet it gently until it feels comfortable. At the same time, she can also provide the cat with food and water appropriately to make it feel safe and comfortable. Hopefully these tips will help your girlfriend develop a great relationship with your cat.