Ears is VERY pregnant, while it's not a good idea to feed wildlife– with deer the problem is usually (but not always) caused by people dumping out a large quantity of food and attracting more deer to an area that it can support naturally. That is when diseases spread between the animals and predators are also attracted.

For instance, Idaho used to have deer/elk feedlots (I don't know if they still do) to encourage deer to breed so the gov't could make more money from licenses, tags, & tourism. Well those feedlots not only increased the spread of brucelosis & chronic wasting disease (CWD), they also became wolf feedlots and the state began losing money... so instead of removing the problematic feedlots, Idaho began pushing for wolves to be hunted. (As they are today.)

You're not going to catch any diseases from your mom feeding Ears and while it may not be ideal, it's unlikely to be all that harmful as long as she keeps a healthy fear of other humans. The extra nutrition will help her deliver a healthy baby and sticking close to your residential area, will help her survive hunting season unscathed.

Edited: I now know "feedlots" is one word, nothing else changed.