Unfortunately Ferns bonding has been pushed back, she came into season Friday, at least thats what I thought she did, she had a mucous discharge from are bits and bobs. Saturday and today she has lost weight, 75g in total. I'm concerned that rather than a season, she has potentially had a miscarriage, so she's getting more time to rebuild the weight and settle. I'm not sure the stress of bonding will be worth the benefit of having cagemates when she can already see and hear other piggies.
It could also just simply be guinea pigs have a bit of a wall they hit at 800g when they've been starved. Poppets weight went up and down as has Olivers at a similar weight. If she loses more weight by tomorrow I'll have her seen again by the vet. Bit of a downer but its always up and down rehabilitating neglected pigs