Grandparents giving Christmas presents

After having a lot of time with our Grandaughter since a tiny baby (she's now 7) our daughter has a new 'hands on' partner who has taken on a lot of the childcare reducing our contact. This is not a big issue but lots of other rules and regs seem to be creeping in. For example for the 1st time ever we are restricted to only giving her 5 Christmas presents even though for the previous 7 years she hasn't cared what or how much we have bought. She's also continually changed what these presents are 'allowed' to be. She has said if I don't follow instructions there will be a row on Christmas day. I'm actually feeling quite stressed now as the new partner seems to be influencing a lot of changes in a short space of time but admit my daughter who is autistic can start an argument in an empty room. My friends say I'm a mug. I'm quite confused. Foes anyone else have this experience?