It’s a CSS answer rather than a WP answer, but adding !important to your CSS rules should do it.
Anywhere in your child theme’s CSS that you would like a rule like this…
.comment-list .reply a {
color: teal;
}
… to override the inline CSS then try using this in your stylesheet instead:
.comment-list .reply a {
color: teal !important;
}
Any rule with !important should override a rule with the same selector in an inline stylesheet.