Its still better than formula, even a few months down the line. Just check that she will drink the defrosted milk before you fill your freezer. I had a pretty good stash built up and it turned out that dd hates the taste and won’t touch it, even mixed in with cereal. HAd to start all over again with scalded milk this time.
I personally pump in the morning- half and the other half in the evening after dd goes to bed. Supply is highest in the morning and I probably could do a full bottle but then DD1 wakes up and I just don’t have the time, that’s why I split it. Basically pick a time and stick to it, your body will get used to it and start producing more milk at that time. And keep alternating while pumping, when milk stops flowing switch sides and you’ll find there is still more milk when you switch back.
Good luck!