Hang in there mom, you and your baby are going to be fine.
When our daughter was this age, she also was in childcare. My husband and I would come home have dinner and then I or my husband would bathe her. As soon as she was in her jammies one of us would feed her. Then she would pass out.... and sleep till the morning..
My mom is the one that gave me her instructions for getting our child to sleep through the night. I have posted this many times, but I will post it again for you.
Once dinner is finished and it is time for bath, one of you prepare her sleeping area. Make it low light, turn on a noise machine or play soft music.
During the bath, try not be too loud or too animated, speak in calm tones and rub her body with long slow strokes. This will give her a slight massage. Make sure there are no bright lights or loud noises (silence your phones and turn down or off the tv)on your way to her bedroom.
In her room dry her, again with long slow strokes. Speak in soothing calming voices. Place her in her jammies and then feed her. Do not speak with her or make much animated eye contact. She will eat and then she will be a "limp noodle" and may sleep through the night.
If she wakes for another feeding at night, keep the lights as low as possible and change and feed her in this calm dark environment and she will drop off right away.
It is difficult to continue this routine, even on the weekends. But you must try to stick to the schedule as much as possible. Your child will need her sleep, you will be amazed at how much growth will take place once she is on a good sleeping schedule. She will also find it comforting to know what the routine is every night.