Congrats on your pregnancy :)
So cool your mum is so involved and excited, my mum was too and so far she has been the best help with my NB!
IMO while all the best intentions to BF, Cloth Nappy, Cloth Wipe and BLW, when it comes to it and your faced with days of sleep deprivation sometimes a disposable nappy and a tub of huggies wipes just makes getting thru the next 10 minutes a little bit more bearable!
T is in fulltime cloth now and has been pretty much since 5 days old, but in saying that its hard to convince grandparents and dads that cloth is as easy as us mums think it is, and for the sake of someone else doing the poo nappy change when all you want to do is eat your dinner i say have some sposie stuff there lol
Dont worry to much about which brand of sposies you end up with, even the el-cheapo's do a job! They might not have 3 poo expolosion guards and winnie the pooh on them but they work haha.
Other than that food is the only thing I would reccommend. Your gunna be so busy looking after that new precious bundle time to eat will be hard to come by! Suggest if she doesnt want to get you vouchers, to grab some weight watchers frozen meals for the freezer? or up and go's. I swore by being able to skull an up & go while feeding in the morning, a bowl of cereal and NB's is a tricky skill to master hehe
All the best for a happy and healthy pregnancy