7wk old nursing troubles

Just wondering if it seems normal for a 7wk old to only feed for 5-10minutes and rarely want the other side? I don't know if my daughter is just efficient or a very light eater. She also pulls off constantly while eating and rarely latches and stays latched the whole feeding. The evenings are the worst with her fussy periods she rarely ways to eat at all. She has plenty of wet diapers but I could pump after each feed and still get 4 ounces. It just seems like such a struggle to keep her latched and feeding for a sufficient amount of time and I have tried the lactations recommendation of laid back nursing with no difference. If I give her a bottle she will usually only take 1.5-2 ounces also. I guess I'm just getting frustrated and unsure that she is getting enough especially of the hind milk. She doesn't have a weight check for a couple weeks for me to find out if she is gaining enough. Just wondering if this sounds normal to anyone who has been there already.