You mean the maids? Yeah, they're completely devoted to her after that. Lana is a fairly major character throughout the series, and she adores 'Sirene'. She finds out fairly on about Fel's disguise and supports her with everything she's got afterwards. (Also, to be fair to them, the bullying escalated beyond what they had initially been going for and they were already feeling guilty even before the accidental poisoning issue, so 'Sirene' standing up for them wins them over completely).