My 16 mth old is on her 3rd mild cold in 3 mths; should I take her out of playgroups till end of winter?

She's had mild fever with coughs and runny nose each time, and though nothing serious, it takes about 10 days each time to fully recover. Though she's average height for her age, she's a bit underweight (not much of an eater and very active, so having coughs/runny nose/achy throat doesn't help our feeding cause). I'm considering taking her out of playgroups till end of cold season (does it ever end?). She goes to playgroups 3 times a week (1 hour each). The downside of taking her out of them is that she really loves them, and they have helped her tremendously in learning to walk, talk, paint/draw, dance. She's very active and will get bored just being out for regular walks... Should I take her out of playgroups, if so for how long; or is being sick just part of the deal, and do the developmental benefits of a playgroup outweight a few bad sleeps and sucky meal times?