i understand the push to keep kids working and focused year round, and the anxiety about kids losing ground over summer. i think it's a real phenomenon, and as a homeschooler, i kept my kids 'working' all the time.
but homeschooling is so different. i think kids really need a break from the strange focus schools give. the conventional wisdom is that kids need school to get ready for 'real life' but the truth is that school is about as far from 'real life' as it gets. it's become the norm for 95% of american citizens, but that doesn't make it any less contrived.
and very young children like yours need the release from having their brains 'on' in that fashion. so my suggestion is to take the opportunity that summer gives you to allow her to learn in a more organic, less organized fashion. allot a certain amount of time every day to reading, of course. i hope that happens every day, but in summer you can just wallow in it. do breakfast AND bedtime stories, and maybe some lazy afternoon under-the-trees storytime too! find a topic that interests her (or that you have a particular desire for her to learn more about) and use that as the focal point for a lot of natural learning. in education-ese it's called 'unit studies', but really it's just interest-based learning. it can be anything from astronomy to dairy goats to victorian fashion to jewelry-making, but within that subject, you can build all manner of formal subjects without the dreariness and drudgery of framing them within a curriculum.
take, say, medieval swordfighting. you can direct some of your reading toward it, through king arthur tales. you can work in some math by figuring out how many chain links go into an inch of armor, then calculate how much you'd need to make an entire suit. you can look at history by seeing how those particular swords came into being, and how they compare to lighter sabers and epees. you can do social studies by researching how knights fit into their communities, what it took to become one, what the advantages and dangers were. you can find a local SCA group and see if someone is willing to teach your kid some moves using boffer swords. you can put on a puppet show for the neighborhood or your family with a knight theme. you can go to medieval times for a field trip. you can practice hand-eye coordination by 'jousting' in your back yard with a ring or quintain. you can check out what types of horses were used for various types of medieval martial arts vs ladies' palfreys.
find the right topic, and summer will be too short to fit all the fun 'learning' activities in, but you won't have your poor kid stuck at the table doing math worksheets, KWIM?
khairete
S.