Apex domains cannot have CNAME records.
Question and response
Question
dig mrsshepherd.com. NS
Answer
mrsshepherd.com. 5 NS ns-372.awsdns-46.com.
mrsshepherd.com. 5 NS ns-1797.awsdns-32.co.uk.
mrsshepherd.com. 5 NS ns-1192.awsdns-21.org.
mrsshepherd.com. 5 NS ns-786.awsdns-34.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0