(I'm going to focus on how to help her, rather than determining if she's gifted according to an external set of criteria.) Whether your daughter is considered "gifted" according to the person/methodology used to test this, go ahead & TREAT her as if she's gifted. In other words, do what you're doing now: spend time with her, help her find things she wants to learn about and focus on, and try to make her educational experience as fulfilling as possible. This will likely mean finding activities at home to further what she learns in school, along with other focuses that are completely separate from school.
Luckily, we live in an age where these resources can be more easily attained than 20 or 30 years ago (I grew up in the US and was part of a nascent gifted program, but it didn't do much for me; if it weren't for my parents, who encouraged the voracious reading I did, and gave me other things to learn about and develop outside of school, I'd've gone nuts from the boredom). So use the internet to find age-appropriate activities for learning opportunities, and guide her in how to pursue a field of interest and learn more about it. If you can find a forum with parents with similarly-gifted children, join in and discuss how they encourage their kids to develop their interests.
Even if she's not considered gifted at this minute by the school system, your encouragement of and participation with her learning could help develop that ability quicker than if she were left to her own devices.