I dont know if your breast or bottle feeding but as far as I've ever known breast fed babies rarely sleep through the night at these young ages and often bottle fed babies struggle with this too, shes only 8 weeks old and going that long at night was very lucky, dont be too worried about bringing her into bed with you, that is the only way i get any sleep at the mo as my lo (4.5 months) is having a phase of waking every 2 hours and before that she only ever went 5 hours at the very most, i think you will both be better off if she comes into bed with you, it helps with bonding too just make sure you let your partner know shes there and you arent drowsy for any reason (like the guidelines say) I took a while to get used to her being in the bed with us, it was sort of an accident that i fell asleep feeding her laying down but now i find it easier we both pass out during a feed, i normaly feel a lot better for it in the morning too