Great advice Daisymelan!!!!
I too think your baby is probably getting more than you think when she nurses. I had a HARD time accepting that because they do take FOREVER to eat in the beginning, but at 5 months, she probably wants to get in and get out to go see the world!!! I too had to start nursing in a quite environment around that age, no talking, music, tv etc...too distracting for him.
Also, if you know you're increasing the calories she gets in the day from what she wants at night, then you know she's waking at night from a sleep issue. And yes...send your partner in at night. That worked great for us!!!!!