Margot having her antibiotic treatment interrupted after just five days isn't advisable. Practice prying open her beak and slipping the entire 250mg capsule down her, then demonstrate the technique to your neighbor caregiver.
While breaking the dose into two may be better at keeping the antibiotic level constant, the convenience of just having to administer the antibiotic once is a fair trade-off to no antibiotic at all. It would make it easier for the caregiver in your absence. To suspend the antibiotic after just five days risks a relapse.