> Her mum wasn't a big dog, her dad was a typical male and I'm thinking she's going to be like her mum
This is why it's always helpful to stay in touch with the breeder of your pup, and owners of litter mates too. Every dog is different but it's nice to get some feedback about how much each pup is eating, how many meals per day, how much the dog weighs and other news. I'm still in touch with litter mate owners of both my wires and they are now 2 and 5 yrs old :)
If you are feeding kibble then small adjustments of 5 or 10 grammes per meal should be enough to keep your dogs weight well managed. Just feel for ribs, keep an eye on output and tweak til you get it right. I find that my gundogs eat ever increasing amounts up to 6 months old then it levels out for a short while before they need more again. Portions are then gradually increased right up until they reach their adult skeletal height at about 18 months at which time I need to start scaling back to maintain a good weight. My youngest at 18 months suddenly looked like he'd eaten a cow as the weight went on almost overnight. It didn't take long to adjust it but I found it interesting that within a few short weeks (less than 2 in fact) he stopped using the food for overall growth and just grew a tummy instead!!
I'm usually pretty good with weight but I hadn't really noticed this time as this was a boy who was always going to be a bigger dog than his uncle, who also lives with me. Usually though you will notice if you remember to look for it, and in a heavy coated breed
feel for it.