How does Maria Robotnik die?

Maria was shot by a soldier, but she didn't die until she had released Shadow from an escape pod towards earth.

According to Sonic Battle, her last Words were "Bring hope to humanity." which makes it seem like she died after she had appeared to in Sonic Adventure 2, Sonic X and Shadow the Hedgehog. Where her final Words seemed to be "Sayonara, Shadow the Hedgehog." or "AdiOS, Shadow the Hedgehog." in the Japanese version.

When She died it wasnt just because she was shot she took the shot for Shadow and when he released him down to earth she couldn't bear for what she did she didnt die peacefully but at least she saw Shadow before she died