he he, I was going to say check your diet, I could see in my bub the day after I had just way too much chocolate...

With a newborn, and you only have one i agree give her what she wants, but I found with ds (#1) he did comfort suck, I could tell because he would continue to suck even if there was no milk, and when the milk wasn't filling his mouth, my nipples would get itchy, 'cause it was just saliva iykwim. I had to use other methods to get him to sleep for more than half hour at a time or he would have snacks all day.

babies also want to suck when they have pain because the feeding is pleasureable and they are trying to relieve the pain.

some of the bubrping techniques I have learnt are
seated position and rubbing back.
from same position gentle rocking back and forward/side to side
quite high over shoulder and firm rubbing. (in this position bubs may stiffen legs and back and raise head if they have pain)
over one or both knees on tummy, rubbing back.

and it doesn't matter if they have a little spew if it means they have no pain, and if they do and your worried about how much they are getting, offer some more.

if your worried, as you mentioned you can change your diet, and as long as it's ballanced it not going to hurt anyone.

but you can also go to your mchn or try the aba for some support .