feeding ????

Ch
Anyone ever Breast and formula fed...I've been EBF ... but I think my supply is down I don't think she's gettin enough...I pumped about 2oz later when it was time to feed I nursed her but she was stil so cranky I gave her the 2 oz in a bottle she gulped them down so fast like she was starving.... Is there a way to check my supply lol I went  and purchased mothers milk tea And lactation cookies today hopefully they help