a lot to do with the ease of delivery of a bigger baby can be to do with the position the mother is in, some positions are far better at allowing the pelvis to open up more to allow a baby out
also, an epidural can make a ventouse or forceps delivery more necessary, as it relaxes the pelvic floor which can stop baby's head rotating correctly for birth.
head size is more important in some weighs than the weight, but if she does not feel confident of being able to deliver, then she needs to address that
being upright, on all fours, supported squat , birthing stool are all better positions for opening the pelvis than lying or sitting on the bed
bigger babies can be easier to birth as their weight is a help !!
induction based on estimated size not recommended by NICE, growth scans and palpation are not always accuarate
to help get labour going, lots of sex, nipple stim, raspberry leaf tea, positive thinking and being relaxed. but babies come when they are ready. she needs to do some reading and thinking positively about the birth....Ina May Gaskin, Sheila Kitzinger, Janet Balaskas, Penny Simkin, Michel odent........that sort of thing , to give her some faith back in her body.