9 weeks ebf sleeps too long?

my 9week old for 2 night straight has slept for 6/7hours straight without a feeding... Is this ok?

so we have had a whole lot of breast feeding issues...it got a little better this past 2 weeks.... however i still have one breast thats kinda ....lazy?....like i will get 2oz out but the other side get 6 or more oz out....

so day before lastnight she nursed on the "good side" before she went to bed about 11pm. she slept til 6am! i felt full and a little hard but let her nurse her fill and then pumped bc i still felt full... however i goy about 7oz combined...

lastnight she nursed on the "lazy" side fell asleep around 10pm and didnt wake up til 6pm! and omgoodness i was so engorged in my "good side" it felt like my boib was goinf to explode i went to roll over to get up and it was instant horrible pain and rock hard!....she nursed which eased some areas.... she passed back out so i pumped and in 5 mins got 6oz out on that side and only 2 on the.lazy side.... still hard in spots so i empty the container and pump again this time til 20 mins later which got another 3oz from lazy side (so 5oz total in 25mins on that side) and another 6 from the good side ..... so in all in 25 mins i got 17oz!!!!

granted my pump is not working as well as it use too and ive only used it maybe 30 times and JUST got the pump 2 months ago... but on its highest setting i still have to squeeze and it sucks to get any out. but i was still seeing milk come out my good side but it starting hurting my lazy side so i stopped pumping... rested for like 20 mins and my hubby woke my daughter so i changed her butt and she was screaming and trying to eat her hand so i latched her back to the "good side" and 10 mins later she detaches and is sleeping again.

should i be worried she slept this long past 2 nights without eating, and should i be conceded on losing my milk supply by her not waking to feed?