Gabriella's travel shampoo bottle originally holds 1 cup of shampoo. She added 1/4 cup of shampoo before leaving for vacation.
To find out how much shampoo is in the bottle now, we can add the amount she added to the original amount:
1 cup + 1/4 cup = 4/4 cups + 1/4 cup = 5/4 cups
Therefore, there is 5/4 cups of shampoo in the bottle now.