Otherwise send her some flowers and a nice card telling her what a big part she played in one of your life's most vital and emotional moments. That would be thanks enough for me - after all she did get to see a whole new person come into the world and take their first breath - that's hardly a chore is it?
Yes I read your story (and had a cry) Congratulations! My sister was there at dd2's birth and ended up helping dh to dress and feed her as I ended up in theatre.. We gave dd2 my sisters name as a middle name. Think she was pleased with that 'thankyou present'! Yes a new bath mat i think! Flowers? Alcohol?