Shame man
I know how hard it is and that it's worse for you because Scarlett has been clingy for the last few weeks
I suggest you spend ALOT of time with your mom over the next few days and let your mom feed her, bath her etc while you are in the same house, just maybe not in the same room and then gradually leave her alone with your mom for a while each day, so that it's not that big of a shock when suddenly you leave her for the entire day.
If she still cries so badly, it will probably only be for the first few days and then she will be fine. It's going to be hard knowing that she is crying, I KNOW!!!, but if we need to go back to work, then unfortunately, we don't have much choice. At least you know that she is safe with your mom and that your mom will be doing eveything to make sure she is happy.
Good luck, hope all goes well. Strongs.