Nobody said anything about 24/7 attention, but 1.5 is still quite young and they do need a fair bit of attention at this age.
If you have time for 10 minutes ball throwing, can you not swap this for training sessions instead? It's more mentally exhausting and won't get their adrenaline levels up in the same way chasing a ball will. I would try doing 10 minutes training 2-3 times a day, and then afterwards you can play something like "find it" and leave her to it.
My beagle is 13 months and our routine when I'm home is as follows. The other days he goes to daycare at 7.45am.
He gets up at 7am, gets let out to the toilet and has breakfast. Then he has to settle while we get ready for the day. At about 8, we go for a walk - normally about 90 minutes. That's his only walk for the day. He then gets a chew when we get home and he normally goes to sleep for the rest of the morning.
When he wakes up, he gets a toilet break and about 5-10 minutes training, then I largely ignore him for the afternoon. Sometimes he sleeps, sometimes he plays with his toys, sometimes he just sunbathes or wanders in the garden. Around 4pm or so we do another training session, and another around 6.30pm or so before he has his dinner. After dinner he gets another chew and again is largely ignored, but he tends to get on the sofa with us for a cuddle anyway.
On days where I skip the training for whatever reason, his behaviour soon deteriorates. Ten minutes a few times a day is only half an hour out of your schedule - you can just do it while you're waiting for the kettle to boil or the toaster to pop. It doesn't have to scheduled in but it is worth doing. Training things like a "wait" or a "settle" could be worth it as well as it helps them calm down overall in my experience.