There's risk everywhere. You could step out in front of a bus in broad daylight. People get mugged and attacked during the day (watched the news lately?).
As far as the risk is concerned, you have to take responsibility for your personal safety. Hi-vis jacket, torch, mobile.
As far as her partner giving her a lift, perhaps she doesn't WANT to leave her 2 children alone, even for that short time. I would prefer to walk home by myself than have my DH leave the children to give me a lift.
For awhile, when DH had a leg injury that made it difficult for him to walk to work, I drove him to and from work five days a week (DH worked nights). It was dreadful. At the time, we just had one small child at home, but it was still aggravating. Mild annoyance in the warmer weather at having to go out at night with our DS and drive him in to work, then drive home, resettle DS to bed. But during the cold weather, it was absolutely MADDENING!! Having to warm up the car, scrape off the windscreen, defrost everything, drive in to his work with DS in his carseat upset because he had been warm and toasty in bed and was now cold in his carseat. Then driving home again and trying to resettle DS to bed, but he was much more awake due to the cold. The whole process took ages every night! And then, of course, I had to get up and warm up the car again and take DS to go pick up DH after his shift as well in the morning. I resented it, but tried so hard not to say anything or show it, and DH hated it because he knew it was not only a massive inconvenience but it cut into what little sleep I was getting and I was getting more and more exhausted.
Don't get me wrong, I love my DH. But this type of thing on a daily basis when there are other factors (children, other partner working and needing sleep), can be a HUGE pain. And that's not even adding in the additional cost of petrol, depending on the distance to and from work. Obviously in the OP's case, it's a mile each way. But again, if she is working a second job to make ends meet, then that small amount of money spent on petrol could be a problem as well.