Hi Helen.
I am sponsoring my child (a minor), we are all in Mx. I sent my application to NS and received on Feb 13, 2019.
Proccessed in NS- May 1
Request for medical results- May 1
Decision made on sponsor- May 2
File fwd to Mississauga- May 6
Medical results received- May 13
File fwd to Mexico VO- June 13
Processing started in Mx VO - June 19
Have you been checking your junk file? When you say "received" do you mean you got confirmation from CIC ?
I wish I could be of more help, hopefully you will be hearing from them soon.