I BF my youngest until he was 2 and also got a mixed responses from medical people but the majority were supportive. If I sensed doubt I would cite the WHO recomendations or say something like "my mother is a nurse but she doesn't seem to understand the value of BF beyond babyhood"...which kinda dared them to question it too. Fortunately one of the last times I BF infront of a medical person was when my 2yo DS had to have a needle... he cried and asked for "bit more" (he version of "Booby") and the nurse was very impressed as it soothed him instantly! she said "good on you mum".

Like Nelle said, maybe you could educate her! A fine service indeed Well done!