I don't have any advice but remember that it is not about you or your husband.. it is all about God!! so it does not matter if you guys are an amazing team together, if you are only doing this because you are "good" then you are doing it for yourself and not for God.
I agree with you to an extent. Yes, it's ALL about God but a desire for service is GOOD! What's wrong with wanting to serve the Body of Christ because you're good and qualified? Shouldn't you be MORE inclined to because you want to use the talents God gave you for Him? This reminds me of the parable of the master who gave 3 servants different amounts of talents. Yes, Talents here is an amount of money, but it's a parable that points to the fact that God gives us gifts and if we don't invest it in the Church or use them in His vineyard, we are doing a disservice to the Church and the God himself, our Master.
The problem here isn't her ego (which I don't see at all) but the "possible" discrimination that some Churches may be exercising.
It's like you're saying she shouldn't feel upset about the potential discrimination in the Church. God certainly sets a path for us, one that has trials and tribulations, so this could be a road to humility, patience and trust in His love.
I find this to be a problem among the "faithful". Instead of pastorally walking through issues in service, many quickly judge the person for being "prideful" and tell them "it's all about God". In those cases, I think it's those people who need to exercise humility.
Let's hear her out first, and walk through the situation with her before throwing her in the "she's just prideful" pile.