Queen Victoria became a grandmother in January 1859 when Crown Princess Vicky's first child, the future Wilhelm II, was born in Germany. Neither she nor Albert saw their grandson for some time (at Coburg on a summer visit in 1859 and from July to September 1861 in England.) There was therefore no regular grandmotherly fussing about to be done on the Queen's side.
The Duchess of Kent died in March 1861, while Wilhelm was still only two and Charlotte a baby. Vicky was expecting her third child when her father lay dying in the December of 1861, so it's not as though her mother was experiencing the daily company of hordes of grandchildren and enjoying the sensation, before the Duchess's death.
Yes, Victoria probably did harbour some resentment for years over Sir John Conroy and the 'Kensington System' of her youth. Yes, she did almost have a nervous breakdown early in 1861 (after the Duchess's death) about how badly she had treated her mother in those early years after she had come to the throne. There was obviously enormous guilt there.
However, with Albert's guidance and when her own family was growing in the 1840's, she and her mother did try to patch their relationship up and the Duchess did become part of her daughter's family, to all intents and purposes. She wasn't barred from family life at all.
As John Van Der Kiste states in 'Queen Victoria's children.' (Pages 40-41) ' 'Grandma Kent' as the children called her, had been loved and respected by all the family since Albert's tireless peacemaking efforts soon after their marriage, and since the removal of Lehzen and Conroy from the royal household.'