I was of the understanding that she would be too territorial to accept any other rabbit into her cage now. Is this not correct?
Most rabbits will accept another rabbit into their 'home' if this is done correctly, for the easiest method it is better to have 2 neutered rabbits and introduce them on neutral territory, then to thoroughly clean out your cage removing any smells of the original rabbit from their. If you just place another female or a neutered male into your females cage without introducing on neutral territory you are more than likely to have a serious fight on your hands.
A pregnancy last approximately 28 days, if you rabbit is not pregnant I would recomend that you contact a rescue, there are many people on here who volunteer within small rescues who can help you. If you get your second rabbit from a rescue, the majority of good rescues will start the introductions off for you which will save you lots of stress and worry. The best and easiest pairings are a neutered male and female.
Many rabbits do not have equal numbers of babies of each sex, which can make rehoming them more difficult. ARC who is the rescue I am involved with recently took in a female rabbit who was obvioulsy pregnant who within 2 hours gave birth to 8 babies, of these 1 is a female, the other 7 are all male. The problem then can be that 2 males can live happily together if they are neutered as soon as their testicles drop, however at times this does not work and they start fighting and will need to be split.
If you wish to search out information about pregnant does there is a search facility in the grey bar at the top of the page, key words then need to be entered.
I hope things work out for you.
Janice