7 month old won't eat solids

Ashley
My daughter refuses to eat solids. Iv tried them all ... she presses her lips together , screams , spits it out , gags or just lets it sit there ...
She is breastfed , and after my atempt to feed her solids, she drinks her milk just fine.. 
she's a pretty big girl, 21 lb .. so I know she's getting enough milk .. but still concerns me a bit. ( will talk to doctor next week) 
Anyone else having problems with solids ?