This could mean several things, so I'll approach it differently for each possibility:
Mum bought lots of food when she finished work today,
or
Mum bought a lot of food when she finished work today,
or
Mum did the shopping
(a common shortened version to say you're doing the household grocery shopping...different to 'going shopping' which might mean going out looking for clothes, or whatever) when she finished work today
or
Mum .. (
all the above options).....
after work today
or
maybe, though I think this is not what you meant,
Mum was off work today and she ...... (all the options)
this one would be because you've used the phrase 'off work' which would usually be used to mean not at work for some reason like a holiday, or a day off, or maybe poorly, etc)
It's been raining on and off for days here.... yuk!! (mind you, we need the rain, the reservoirs were VERY low after a year's low rainfall, until a week before Christmas, when it started raining and seems never to have stopped!!!! I looked at a webpage on Sanya today, it looks utterly beautiful.
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Thank you so much!
Mum bought lots of food after work today.