Darlene, I am just seeing this now.
I second EVERYTHING Donna/Donnarae/Possi said earlier. Be with mom; spend time with her. You will NEVER regret time spent; you may regret time not spent, for years and year and years.
To heck with the tax returns and extensions. If you get to them, fine. If not - and any client screams - you do NOT need clients who waited until the last minute themselves and then got mad at you for spending time with your mom. You just don't. Those people are spiritual poison and you don't need them in your life.
Prayers for your mom and your whole family; may the Lord hold you in His hands and give you His peace that passeth all understanding.