I'm not sure exactly when these were published, but at least ten years or more.
The main character discovers she is perfect and was created in a lab by her mum, who is actually the scientist who created her.
Throughout the series, people try to capture her. She then finds out that she has brothers and sisters created like her.
Not sure how many books were in the series either. It's a series for young readers (my friend read them around age 10) and would have been published no later than 2010.
This might be Marilyn Kaye's Replica series (I borrowed from my answer to Identifying a super-soldier novel with half-moon symbol).
"Replica" is a children's science fiction series about Amy Candler, a young teenager who discovers she is one of thirteen cloned girls who have been genetically modified to have superhuman abilities. She was created in the government-funded Project Crescent, and was kidnapped and adopted by one of the scientists after a change of heart. Throughout the series Amy struggles to live a normal life as the mysterious Organisation tries to use her and the other Project Crescent clones to create a master race and take over the world. Amy also seeks to help the other clones in the project, and encounters a number of other children and teenagers with genetic modifications or supernatural powers.
Amy is indeed a clone, the result of a super-soldier project. She essentially has peak human capabilities including extreme strength and speed, and the ability to pick up skills rapidly. In particular, Amy's abilities develop in the first book in her practice of gymnastics. As per your description, her mother rescued her when the facility burned out (implied to be sabotage whether by researchers, rivals, or Project Crescent itself) and Amy finds that there are more girls like her out there. Within the first two books, she meets one who is a French ballerina and one who is a minor movie star. She does have non-powered friends in her school.
It looks like books 6 and 12 deal with "Andy", who was genetically engineered to be her "perfect match", with more "Andies" showing up in the 18th book. That may be who you are remembering as her "brothers" since they were created in the lab in a similar manner at the same time.
Possibly "MILA 2.0" by Debra Driza (2013) and at least two sequels. From a review on Goodreads:
Sixteen year-old Mila believed she was a human living in a small town with her ‘mother’ after the death of her ‘father’ and was never meant to find out that she was an android, built in a science lab and kept hidden to avoid not only the person who helped create her but another group intent on using her for her abilities.
I have read only the first book. It fits your description well enough for Mila herself. I do not recall any siblings being mentioned explicitly, but from the back story it was certainly possible that there were some. They could well have been introduced in a sequel. There is a prequel short story "Origins: The Fire" that is available as a free Kindle download on Amazon.
