Greetings, mimi233!
Thanks for reaching out to the Apple Support Communities! That is a great question you have about seeing if your iPad has sent an email and I will be happy to help out! I recommend going to the Mail app on the iPad and when you open it, you should be in the All Inboxes section if you have multiple email accounts, or the Inbox if you have one account on the iPad. At the top left, you should see Mailboxes. Tap that option and you will see different folders, including Sent. If you have multiple email accounts, please open the account by tapping the account name to see the Sent folder. Then enter the folder to see what has been Sent.
Have a great day!