Hi Nelix and welcome to the forum. All I can add is to try some of the carrying and moving techniques other Members have mentioned.
Also give her some time, sometimes it can take a while to get used to having a doll around. Have you given your lady a name? As another Member has suggested maybe just take some simple photos of her, doesn't have to be professional, I'm not great at taking photos.
Those are just my suggestions😁
If it is her weight that is a major factor in you wanting to sell her there is another option. You could keep her head and give her another body, but in a fleece material. There is a company called Valentina Girls that will make a fleece body to fit a TPE head. Obviously this will make her a lot lighter, but she will be very restricted in posing and the photos you could take. But that is a kind of last resort. The body of a Valentina Girl is more fantasy than realistic, and she will also be very soft and cuddly if that's the kind of thing you like.
This is basically what she would look like with your ladies head on her body