Move the navigation menu higher

It might be easier if you do it the other way around. Adding the logo on the menu area.

– Disable the Header on Frontier Options -> Display
– Add the code below on a child theme’s functions.php

add_action( 'frontier_before_menu', 'add_logo_on_menu' );

function add_logo_on_menu() {
?>

<div id="header-logo">
<a href="https://www.stella-makeup.com/">
<img src="https://www.stella-makeup.com/wp-content/uploads/Logo/Logo_Stella_small.png">
</a>
</div>

<?php
}

– Add CSS code below on the Custom CSS tab.

#nav-main .nav-main {
    float: right;
    margin-top: 40px;
}

Perfect! Thank you!