It is usual for babies on a mixed diet to have messy stools. The stools will certainly have changed since you began weaning her, simply because her diet has changed. I do not think it is wise to restrict her diet though. She needs a good varied diet and as long as she is healthy and gaining weight, it does not really matter what her stools are like. Wholemeal bread can be a bit too rich for babies and this may be the cause of runny stools rather than cereals or fruit, but if this is what the rest of the family eat, I would persevere. She will get used to it. The idea of weaning is to move her from milk to a family diet. I would suggest that you give her what the rest of the family eat and let her get used to it.