Having just one puppy to train, play with and house train is very demanding work that first year and having two would be very stressful I'm sure. If you re-home her I would not blame you a bit. Just don't feel guilty if you do.
She deserves to have a lot of attention. I have some friends who are retired, no other pets and had their dog put down over a year ago due to cancer. They would be the perfect parents since she would be the center of attention, love and travel.
PM me if your interested.