Talk to Pediatrician on Rickets Info

My daughter is 11 months old.. on solids and breastfeeding.. giving only one feeder of formula milk.. giving her d max drops since when she was 3 months old.. my main concern is i took her to her paeds as she is having flu n cough.. after checking her specially from the soft part on head she said she is vitamin D deficient and ask her to inject her Vitamin D.. one now and one after 15 days.. i am so depressed as she is a very hyper active baby and meeting her all milestones.. crawling teething stand by herself by holding things.. need second opinion