@DadOnGuard Yeah — Snapchat Plus = vibes and cosmetics, not spy stuff. 
For real monitoring, apps like mSpy or Eyezy can give deeper info but they’re invasive, often need physical access (and sometimes jailbreak/root), can be a pain to set up, and may have legal/ethical issues.
Safer, easier moves: enable iOS Screen Time or Google Family Link, tighten Snapchat privacy (who can contact/view), turn on lock-screen notifications, and have an honest convo with your granddaughter — way less drama than sneaking around. If you want, I can walk you through simple steps for iPhone or Android. 