Blankets are as much a halfway solution as Reflexion Filters. In both cases, the most flattering thing you can say about them is they're better than nothing.
The purpose of acoustical treatments for vocals is to reduce the level of reflections from room boundaries (floor, ceiling, walls and windows). That requires significant absorption down to
at least 400Hz. 200Hz is better. Blankets are effective down to about 1 or 2 KHz. Any resonances below that, and the most damaging resonances are typically in the 400-600Hz range, will not be affected by blankets.
Monique is also sitting on a leather couch, which probably isn't helping!