My fiances co worker invited him round to fix her fridge, am I being insecure?

My fiance fixes stuff like appliances etc, one of the women there asked my fiance if he'll pop round to fix her fridge instead of her calling someone out which makes sense, she's a receptionist and he sees her everyday but isn't overly close to her I assume.. she's older than us too by another 10/15 years, she's assuming he'll do it for free as she said she has alcohol if he'd like to take some home.

Is this normal/just friendly? Why couldn't she have asked any of the other workers there? Am I just being insecure?

Updates
+1 y
He told her how she could fix and she still said 'can't you just come round' might not be good with fixing stuff herself?
My fiances co worker invited him round to fix her fridge, am I being insecure?
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