Ay hindi ka nag-iisa momsh! Marami talaga kaming ganyan, side-lying lang talaga the way to get them to sleep, especially pag pure BF pa. Ang good news, 6 months pa lang siya so pwede pa definitely i-adjust, though alam mo naman 'yan na nakasanay na siya kaya it'll take patience.
One thing I heard from a friend na nag-work from home din while breastfeeding, try the "chair method" where you sit next to the crib first, let baby fall asleep on breast still, pero then you slowly move your chair away each night, one foot at a time, hanggang eventually kaya na niya mag-sleep without you lying down. It's gradual pero it works, lalo na may schedule siya at mejo consistent na ang sleep pattern nila around 6 months.
Also, some mums mentioned na by 6 months, medically okay na ang baby na mag-sleep through the night without feeding, so you're not starving her if you skip one session, pero ease into it lang, walang rush. The tricky part is breaking the habit of needing you to lie down, not so much the feeding itself. You've got this, and honestly props sa'yo for managing WFH solo, that's chaotic haha!