Or even just cut out the junk food whilst she is at work?
Not long after she first started we asked her to stop feeding the DCs take away for lunch regularly and to ensure they ate at least some fruit and veg each day. This has happened more or less. She still relies on more processed food than I would like, but she is not that confident with cooking so cooking from scratch every meal is not an option.
The main issue is that she obviously doesn't eat any fruit or veg herself, drinks fizzy drinks, bags of haribo and other sweets, pasties and other 'junk food' most days at work. I would prefer she and the DCs ate the same food. I don't think it is helpful that as an example they have homemade sandwiches and she eats two happy meals - this happened when they last went for a picnic. As a side issue we also pay for her food whilst she is working, but this is primarily as she eats with them to model good table manners and eating habits. Paying for the bags of sweets and unhealthy top ups grates.
Is it unreasonable to say we will only pay for her food if it is healthy (ish) and we don't want her bringing 'junk food' into work/our house every day? I'd also like them to see her eating veg with her meals, as the DCs now say they don't like this and that, but realise that might be a step too far.