If she's more comfortable with your girlfriend, it could also be things like holding her in ways that support her full length; picking her up from behind the head instead of going reaching straight toward her face; less sudden movements; not grabbing or restricting her movements, etc.
And it could also be that her first handling experiences with you were more stressful than her experiences with your girlfriend, and she associates you with that - even if it was just timing and not anything you were actually doing. So you'll have to let her learn that you aren't a threat. Go slow, keep it short, and try to keep handling experiences as positive as possible. Take her out when it's evening and she's already awake, keep the lights off, and let her decide when to move or not move. And try to put her back while she's still in a good mood rather than waiting until she's freaked out. That will just make her associate being out with scary experiences.
And also what everyone else said.
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