Making sure your mom has a phone that best suits her needs is vital, and we're always here to help, mbeddinger.
Although we are unable to recommend third party apps, there are many apps out there that you can download to help.
As your fellow community member, tikibar1, mentioned, you can use Google Assistant on Android devices. You can visit https://support.google.com/assistant/answer/7172842 to see what you can ask Google Assistant to do, including calling someone.
If you purchase an iPhone, your mom can use Siri to call people as well. Visit https://www.apple.com/ios/siri/ for more information regarding Siri.
I trust this information is helpful. Keep us posted if you need further assistance.
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