It is worth looking at a new partner for her, especially if she lives outside. Most rabbits do much better with a partner.
See if there is a rescue near you that has a single neutered boy. Sometimes older singles can be difficult to find homes for, or maybe you could look at a long term foster for one with additional issues - you care for bunny, Poppy gets a companion, rescue keeps up with medical costs.
There may also be other places to try - sometimes you can find genuine cases for rehoming on the online pet sites. A caring owner will have vaccinated and neutered their rabbit, but you need to be a bit more careful in assessing what you are being told. There is no back-up if things don't work out, though. So a rescue is worth looking at first.
There are sections on here about how to bond rabbits, or some rescues may be able to do it for you.
If you don't feel you can take on another rabbit, look at having her as a house rabbit, so she would get some more attention and interaction.