sorry for your loss, but only qualified medical expenses you paid would be deductible. they're deductible in the year paid. but to be of any benefit your itemized deductions would have to exceed your standard deduction.
since you cared for her in your home virtually none of the expenses for the home except possibly certain capital expenditures would qualify. see IRS pub 502 for details of qualified medical expenses.
https://www.irs.gov/pub/irs-pdf/p502.pdf
