Glad to hear Daisy is improving. Love & Cocker snoggggzzzzz from my two.
When Bess was young, she had very irregular seasons & I figured that it was going to cause problems when she got older, so I had her spayed. I've never once regretted it.
If you have Daisy spayed, it will prevent lots of problems such as Pyometra (not sure if that's how you spell it). It's a life threatening condition that is quite common in un-spayed bitches.