Cat suddenly afraid

I have two indoor cats both 2yo that like to go out into my garage during the day for the heat and the smells for the yard tools. Yesterday I let one of them Ember outside by herself for a bit as usual and then I had to go out to run some errands so I went out to get her. For some reason suddenly she's now anxious and scared of the garage door area and my shoes? She does puff out but any areas near the garage door like my foyer where the shoes are kept and part of the living room she will slow walk low to the ground and she basically refuses to walk past (the foyer separates my bedroom which she likes and the rest of the house including litterbox and food)
I don't know what the sudden deal is. I checked her for any marks or bites, when she's in the rooms further away she will act basically normal not scared, walk, play, eat, so it doesn't look like she's hurt herself in anyway.
I tried holding her and walking on top of the shoes which she was fine with and was obviously watching closely and then I tried holding her sides and slowly walking her past the shoes and garage door but she will suddenly make a small hiss and bolt to the other side then sit down.
Not sure what to do here I am worried about her and why this has happened and worried she will start peeing in the front of the house since she won't pass to the litterboxes without me picking her up.