Acquiring a new tortoise

[msjaffacake]

Hi I'm acquiring a tortoise from my neighbour she's had for 15 years. The tortoise is 50. She lets the tortoise roam in her conservatory in cold/bad weather and in the garden when it's nice. She's retired so she's always in. I work full time so I'm wondering where can I put her in the day? She said she'd like her to carry on living like she does. I asked her if I can leave her in the garden when I'm out but said noo. Someone else I spoke to who has a smaller, younger tortoise says his is in his garden all the time unless it's really cold. So what do I do? I'd like her to be able to roam in the garden but are there any predators I should be aware of? Cats/seagulls? My conservatory will be way too hot to leave her. When it gets cold she can go in the conservatory. I don't want to "downsize" her roaming area too much when I'm at work. Any advice please would really help. Thanks very much