If you're registered with a dentist you can book her first appointment and they will have a quick look to see if everything's all good x
I spotted my little one's molar when I was just playing with her leaning her over my legs so her head went upside down and she was laughing, then I got a good look in her mouth, especially from that angle it was easy to see the top ones!
You could try when she's asleep. Also when I give my boy teething powder I move my finger on his gums so can sometimes feel any new ones x