Hi armis,
Take a deep breath and slow down ... let's be calm about this.
1. Did you check the recycle bin/trash can of your email program. Could the email still be in there?
2. Do you know which day your mom is supposed to fly? If so, you (although it will probably have to be her) can try to call the airline and get the booking reference code. From there, you will be able to check the flight details on the Internet.
Cheers,
GenevaFlyer