Am I terrible for thinking my mom can still live alone?

My father died last fall, and my Mom has been staying with myself and other family because her house is in a remote, rural area and we don't feel she is safe there. However, she is very healthy, still drives, is still very mentally alert, etc. In fact, she only retired from her full time professional job two years ago to care for my Dad while he was ill. I think Mom is getting really bored and depressed living with us in our houses, and she seems interested in the idea of getting a nice apartment in a very safe upscale suburb, so I've been helping her look. My sister thinks I'm terrible for even considering letting Mom get an apartment saying "this is the age where you bring them back home..." I honestly think Mom's health, both physical and mental, will deteriorate if she continues living with us because she's bored and doesn't have any real autonomy, so she just sits around and watches TV. If she had an apartment, I think she'd stay busier, like she did in her own house when Dad was alive. Am I crazy and/or inconsiderate for thinking she can live alone ? I honestly don't mind her staying with me, I just really don't think she's "there" yet....she's too independent. Although she seems to be losing that independent spark the longer she stays with us...