I.G.
I am sorry to tell you but if you have not nursed or pumped for a month you are probably pretty dried up.
I do not however think that you should give up, there are many women who have successfully relactated, but at this point I would not think that you produce enough milk to exclusively feed your baby.
If you are serious about it consult a lactation consultant for help.
To get started you must set up a regular pumping regimen, if possible every two hours with a hospital grade pump until you start seeing more milk - even an ounce would be a success.
If your baby latches on at all, I would let her suck for however long she wants and then bottlefeed while you are pumping. Choose the smallest/slowest flow nipple to bottlefeed, otherwise your baby will refuse because it is so much easier to drink from a bottle.
Breastfeeding doesn't have to be all or nothing, if you wish to continue it would be nice if you could at least relactate for a few partial feedings a day and supplement with formula...
It's going to be hard work but if you are up for it, I am sure you can do it. Get some professional help or contact la leche league.
Good luck!