Any suggestions? Baby is never entertained!

Maybe it’s just that the days are blending all together, but my little 6 month old girl is never entertained with anything. Well, maybe for a moment, but that’s it and then I find myself running out of ideas. Tummy time? For a minute and she’s freaking out. Walk around the house? Only for a minute. A toy on the play mat? 10 seconds looking at it then she throws it away. Me engaging with her? About a minute and she is fussing for something else. A book and a a song is good for a few minutes but doesn’t fill the days too much. Plus it’s exhausting to sing to her all day! lol (trust me, there’s been days where I have hahah) She’s fed on demand and sleep trained so she has structure and is well rested. The only thing I can think of is that she is teething. I also have this classical music that she likes but only because it plays with stars going across a large screen while playing and I don’t want her “watching tv” at this age so i limit that.

Is this just a normal phase where babies are sometime just unsatisfied with anything? Any suggestions of some thing to keep her entertained for more than a minute?

Thank you ladies!!