Name & PB are negotiable;
She is MJ Clarke's oldest sister, and the first of four - after her and MJ there was a set of fraternal twins. Their mother passed away shortly after they were born, so it's unlikely that Aspen remembers her at all;
How did she personally deal with losing her youngest sister?
The rest is up to you.
Even through the tragedies her family suffered, Aspen always managed to keep a visibly positive outlook in life, not believing that being down is productive for anything. She is brash, impulsive and doesn't like rethinking her actions after they're done. While she comes across as quite fickle and irresponsible at times, she actually has a good head on her shoulders and sticks to her duties like glue, seeing them through to the end every time.
Aspen was the first of four children - she was followed by MJ Clarke a couple years later, and then the fraternal twins Justice and Vivian. Unfortunately, their mother couldn't withstand birthing two kids at once. She soon fell into a coma and perished, leaving behind a widowed father and four half-orphaned children. From then on, their upbringing got rather rough - it's difficult to raise four children on a graveyard keeper's salary. In a mix of hard work and the kindness of neighbors (as their grandparents washed their hands off of the trouble), they managed to make it through without ever really lacking any essentials. This of course meant that the kids had to get creative and resourceful when it came to their own entertainment and quality of life, which they most certainly did.
They were all enrolled in Muggle schools growing up as Maxwell had very little knowledge of the magical world to begin with. Every kid displayed magical ability to a variety of degrees, and when Aspen completed her fifth grade in the Muggle system, she got her letter to enroll Tallygarunga. It was far more her speed, and she discovered her true love instantly - Quidditch. Despite the stellar start, everything would come crashing down just a few months in - Vivian disappeared from her Muggle school, never to be found again. It tore the Clarke family to pieces. Maxwell had the presence of mind to pull the remaining two kids from that school, at which point Aspen informed him of the existence of Whitlam Bilby. They were enrolled there and brought together again, something much needed for the grieving family.
The emotional strain was always hard on them, but Aspen had the presence of mind to steel herself and be the rock for her younger siblings, and to help her father out. When she turned 15, she started doing paper routes for a local newspaper. She saved up for a whole year to buy a decent broom for Quidditch, but kept at it in the job afterwards to further help out in the house. Now, in her last year of Tallygarunga, she just has to hang in there a little while longer before she can really help Maxwell...