Hi,
When my baby was the same age as your baby, my husband and I, both were working and our baby too was going to a daycare. I think, what you can do is, do the preparation of her food the previous night, or if you are an early riser, you can make her feed in the morning itself.
You can make boiled rice mixed with vegetables or pulses in it. You can also make porridge, or boil vegetables in advance. So, when you come home in the evening, all you have to do is to heat the food. Or you can put rice with veggies, or pulse (which is easy to digest for the baby) with apt amount of water it requires in the pan. So, when you are back, you just have to light the gas for sometime for the food to be ready for the baby. You can have fruits and buns handy at home, so if the baby is really hungry, you can feed the baby little fruit or bun till the time food is being cooked.
And do not feel bad at all, you are doing a great job. Babies never let their mothers breathe easy if they are not comfortable themselves. If your baby will be hungry and you are not feeding her at that very moment, she will put the home on fire with her cries. :)
Read more