okay... now i've got more specifics for you.
8:30am - 1pm is way too long for a 6-month old to be awake. if she's up around 8:30 have her back down for a nap around 10/10:30 and again around 1ish. she will probably need a 30min catnap around 5pm and bed by 8.
it's likely that she is overtired by that first naptime, throwing off the rest of your day & then she can't sleep as well at night.
cluster feeding is just breastfeeding.
at this point, she is still getting most of her nutrients from your milk, so don't worry about increasing solids at this point - 2x a day is great.
HTH