Taxes Question

Long story short, me and my partner (not married) filed taxes on here and TurboTax put in both my kids for my partner and I’s EIC credit. Now our taxes are messed up and I have to refile to get our maximum refund. I have to amend my return on the 15th of February when it opens for that. Would it be fastest for me to do that then have her refile by efile? Does she have to file by mail now since IRS doesn’t updated amendments for efiling? Need a little guidance please.