Your thought was correct, but your drug pick was wrong. Those lips are plumped with collagen, not Botox. The general rule is: Above the eyes, Botox; below, collagen.
Botox is a nerve poison that reduces wrinkles while collagen is a filler.
Well, she's probably using the collagen on her lips and eventually use botox on other areas.
Also eventually there will have to be another area packed with alum.