15 yr old female schnauzer with congested heart failure

Can she have vanilla icecream? How often and how much? She has been my very best friend and soulmate since she came to me at 6 wks old. My purpose is to her as hers'has always been to me,100% undying love and devotion!!! To make her as happy and comfortable as I possibly can. No one can ever find the perfect words to describe what she truly means to me and my life, as I'm absolutely positive that she feels that and more for me. Anyway, I really just need know what human foods are ok for her to have ??