Seconding this, also, reproducing her voice with an AI may not be something she is on board with, it could make her feel like you don't accept her with or without a voice. It may also be unhealthy for you, similar to how spending too long on social media can become a dangerous source of dopamine.

It might make sense to consider making a recording that is more meaningful, and focus on giving her emotional support rather than building an AI that could be perceived as a replacement.