One way to see what fraction is bigger is to find the GCF. (greatest common factor) Meaning, find a number that 10 and 15 can multiply to. Let's say 5. Since you divided 10 by 2, divide 7 by 2. Since you divided 15 by 3, divide 11 by 3.
7/10 becomes 3.5/5
11/15 becomes 3.6/5
So, Daisy buried her bone deeper.
Hope this helps! Sorry if it doesn't make much sense just ask me if you have any questions! :)