Unfortunately these days many families have to have both parents working... Like myself & DH.. We have 2 girls DD#1 is 7yrs old & DD#2 is 4-5 months!
With DD#1 I didnt work until she was about 3 yrs old, my exsperience then was that she was SO used to having me around 24/7 that she ddnt cope very well at all initially, even though she was at a close family friends house everyday with her kids & she loved playing with the other kids...
But her hair began falling out in patches, she wet her bed at night (she was totally toilet trained at 22 months!) I felt awful, but I had to work, she was quite shy when it was just myself & her, yet now she is not at all shy, she has tonnes of friends at school, is exceptionally popular & comfortable to go to anyones house after school, she is extremely confident & I am glad now to see the change in her & she realises she can have an opinion & not hide behind Mummy has made me really proud. She has been in the school plays & made up her own dances with friend in the Rock Eisteddfodd where she gets up on stage infront of the whole school... Honestly she is a different child..
I now had to return to work when DD#2 was just 4 months old & I hated it, the first 2 weeks I sobbed daily at work & felt miserable & like a bad Mummy.. But DD#2 is fine, she is happy & content & really we need to work to provide for our kids & I am slowly realising I am not a bad Mum, nor will I be the first or last Mum to have to return to work...
I am sure within a month of Family Day Care (also my preference over Child Care) she will be loving it & telling you all about how much fun she has had!!!
You will both get used to it... I work 40+ hours a week!!! We cope & I am certain you will too...

Best of luck!