Difficult mother?!

My mother has been very difficult to get along with lately. My kids and I are visiting with her, I’d rather stay in a hotel but I know she’d prefer us to stay here with her. The last time we visited we stayed in a hotel and she made a fuss about us wasting money. That being said, yesterday I went into her office and asked if she had a soda in there as we’d run out in the main house. Her response was “no, you guys drank all of my soda” I drank one and my son drank one of a 12 pack of soda. This is after she got onto me about purchasing a 12 pack of soda because she has (well now had) soda in her office. My son wanted to talk to me about a personal issue, he started to whisper to me (I told him it was a rude thing to do amongst other people) he asked me to go with him into another room to have the conversation and she refused to let us leave the room without having the conversation in front of her. Today she was taking a prescription for cold medicine. I asked her if she had a cold, she told me “no I have a cough” (she said this with a very rude tone)she also has a runny nose so I jokingly said “sounds like a cold to me” hoping to lighten her mood because I get anxious when she has an attitude. She didn’t receive it as a joke and snapped at me about how it’s just a cough. After that my oldest daughter wanted to go outside and play, I was in the middle of prepping dinner and wanted to move onto the next thing without finishing the task I’m currently working on. I’m currently in the process of slowing down because I rush through life (because of her) which isn’t good for the nervous system. I guess I wasn’t moving fast enough for her and she snapped at me and said “would you hurry up what you’re doing and take Emily outside” I told her I was just about finished and needed to take the groceries I’d just had delivered to the basement fridge as there was no room in the main refrigerator. She then snapped at me and told me to just stuff the groceries anywhere. I rushed and it put me in a flustered mood so much so that I turned my back on Emily (who’s special needs) for literally a few seconds (I know better) and she ran into the road. I told my mom about it and she could seemingly care less. It however, caused me to feel uncomfortable. I love my mom and I’m the only one of her children who is willing to have a relationship with her but it’s hard. My youngest is scared of her because she is constantly yelling at her threatening to spank her over things, even small unintentional accidents. We’re supposed to be in town until mid June when my husband returns from his work trip and I am already ready to leave.