If she's not into yuri and she can't work up the ovaries to actually use it on her crush, she should let her friend use it and get into these yuri shenanigans too.
@ThermiteKitty She actually planned to give that spiked drink to teacher in chapter 2, but the drink was taken away and successfully drunk by delinquent. @KZO Yuri harem may also be a possibility. @Monpetitlys She is not into yuri, but yuri is into her.