New to breastfeeding !! Advice please !

I collected 1oz from my letdown while I nursed my daughter. She already nursed from both sides and started to get frustrated with me like maybe she wasn’t getting all the milk she wanted from me.

So I tried offering her the 1oz I got in a bottle and she didn’t want it. She put her mouth in the nipple but didn’t latch on to the bottle. Can I still add that oz to what i have collected throughout the day ? I plan on freezing it