How to increase my enemy's health every time player gets an increment of 50 score?

Question

To increase difficulty of my game over time, I am thinking of increasing enemy's health everytime player's score gets an increment of 50. Each enemy kill gives 10 points to the player.

Now I don't understand why I am having trouble with this as it can't be that complicated.

This is how I am trying to make it work but creating a new instance of enemy resets the health back to original (100). How can I get around it so that new updated health gets applied to all new instances of enemies after every 50 score increment?

Code snippet:

struct Enemy
{
    Float2 mPos         = Float2(0.0f, 0.0f);
    Float2 mVelocity    = Float2(0.0f, 0.0f);
    Float2 Knockback    = Float2(0.0f, 0.0f);

    float mHealth       = 0.0f;
    float mLastHit      = 0.0f;
};

// How often enemies spawn
gameState->mEnemySpawnCounter = 5.0f;

Enemy* enemy = new Enemy();
gameState->mEnemies.push_back(enemy);

// This is likely the issue as after a new enemy spawns, health gets reset to 100. How can I get around it?
enemy->mHealth = 100.0f;

// Enemies health increases specifically on multiples of 50 score and then gets reset back to 100 (If the score becomes 60 for example)
if (gameState->mPlayerScore % 50 == 0 && gameState->mPlayerScore > 0)
{
    enemy->mHealth += 20.0f;
}

I guess I need another variable to keep track of enemy health? Any help on this will be much appreciated.