Maybe she is just protective needs some privacy rabbits are prey animals and generally don't like when anyone see them nursing or touching their kits, I don't know if you take them out of nest once a day for 5 mins that's fine but some mothers don't like it, one of my girls Bernie is happy to share and I can take them when she is there and she is happy, but Smokey wouldn't let me go near her nest I remove her and then check the kits quickly, if they look good and fed I check max once a day for first week and then just leave it to her, also I place something like a blanket over it to make her feel safe. You did great job you gave her nest and babies are fed and she will take care of them, rabbits are good mothers.
If you want to bond with her and build trust you better don't approach her in her cage and don't pick her up, sit next to her reading and give her time to come out and approach you if she wants, but honestly nursing mother maybe just doesn't want much contact, it is normal.
Lovely kits, now look a bit overfed sure they have much milk for only two of them. I had one overfed kit once I named him Spud he was real big fat lazy boy. Soon when they are 2-3 weeks they will start exploring territory and exercise they still have to stay in their cage but you can attach a playpen to it and let their mother out for day so she can be active and get some rest from them. Then you can sit next to playpen and read or play with your phone not paying attention, get to her level sit or lay on the floor, do it regularly for a week or two and you will see changes