tip it out of the pot.. and find out if it is severely root bound

and let us know ... or better.. give us a pic of that

it has to be a water issue .. so you are either not watering enough .. or the roots are having problems ...

tell us about how you water it .. how big it is in relation to the pot .. and how the roots look

ken

ps: the other option is that it simply hates you ... so get rid of it..

Totally agree with Ken. Usually store-bought plants are in dire need of repotting when you buy them. If all you've done is look at yours, it's probably pretty bad-off.

The soil may also have become so dry that it's hydrophobic. Try setting the pot in a saucer of water for a few hours. If all of the water disappears, keep adding more until it stops disappearing. Repotting can help fix this, too. Stay away from peat as potting soil.

The expression "fresh as a daisy" isn't meaningless. Individual daisy flowers don't last long - a day or two. Cutting off dead flowers is a daily task if you want these plants to look good. Next year, you might prefer the daisies in the ground and something more tidy in your pot(s).