As I have said to you on your other threads, being alone isn’t good for her. She won’t do anything else if she doesn’t have another piggy to play with. No amount of human interaction will ever be enough and at two months old, she is far too young to be alone, she is missing out on essential socialisation that young piggies need.
Siting on your lap all day - as mentioned above, she must have constant access to hay so she shouldn’t be on your lap for long as otherwise she won’t be eating enough throughout the day. Sometimes the piggies who sit still and don’t struggle to get away can be the most scared. They don’t move because of fear. Also though as I’ve said, as she doesn’t have a friend, she doesn’t have anything else to do.
If she is eating out of your hand then she does trust you.