you could... divide the part that goes flat, and leave it till the end of the process.
Divide the remaining part into 3 and make with the botom 2/3rds a low pony tail with that invisible rubber bands...
with the 1/3 that remains, (it will be the blob), comb it straight in a 90º angle, tie it somewhere along the middle in that angle and take it to the end of the original ponytail. it has to be longer than the point where the first ponytail begins, then when you take both ponytails together, it will lift up. Secure it with bobby pins (our best friends).
finally, comb the flat remaining part and secure them with bobby pins as well and cover up with a thicker band.
If it is confusing, I could try better.. is it understandable?