More breastmilk for shorter period of time OR less breastmilk for longer?

I went back to work last week and haven't been able to pump enough for my LO so we introduced formula. I absolutely hate pumping but am committed to doing it until 6months and giving baby girl whatever I pump. The woman I send my LO to for day care suggested giving her less breastmilk every day and freezing the rest to stretch it out to 9 months or so. What would you do? Less breastmilk every day now to stretch it or more and switch to 100% formula around 6 months? She'll be 5 months old in a little under 2 weeks. Thanks in advance for sharing your input!

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