Hi,
Her number of feeds are a little on the low side. Most babies that age do a whole lot better on 8 or more feeds per day - 12 or more is pretty normal. So the simplest thing to do is feed her a bit more often. Always offer - if she is grizzly or irritable, offer the breast as the first option - avoid dummies or other ways of soothing. You will usually find babies who have a long sleep at night will have a cluster of feeds somewhere during the day - let her feed frequently during that time. 90g per week is a little low - nothing to panic about though. Just try to feed her more often. Does she have both breasts at a feed? If not, it would be good to offer both breasts as well