Just like Helena went into heat at the time she wanted, she had plans to stop her heat too. Just in case, she bought the immediate heat suppressants, so she could use them at least for later. But didn't expect she would have to use it that soon when she was left alone, slowly losing her mind.
While she was recovering, she could smell the two scents flowing in the air, mixing together, showing off the bond they had just created. The pheromones made her go mad as she couldn't believe Viona chose Ethan over her.
Why the hell did he also have to go into heat at that moment?
She thought if it wasn't for him also going to heat, she could have managed to convince Viona to help her. She witnessed it herself. When that heat pheromones reached her nose, she tried her best to cover Viona with her scent, so she wouldn't find out about him going to heat.
But it didn't work as she watched Viona pushing her away, running out of the room, calling his name.