150 is an eye-popping amount to spend on one. What you'll get for that money is a piece of junk that will make riding a chore, be heavy, unreliable and cost you the price of the bike again replacing poorly made components.
I'd budget at least £300 to get a decent bike, if the budget will stretch more towards £500 even better. It feels expensive at the time but a decent quality bike will last you 10-15 years with proper maintenance. You may get better value second hand but as a first bike I'd caution against it.
Material: at this price you should get an aluminium framed bike. Towards the top of the budget you may get carbon (forks, this is good but not essential)
Type: Dutch bikes are heavy and cumbersome to ride, I wouldn't get one of those if you intend pulling a trailer behind you.
This pains me to say it as I don't like hybrids, to my mind they combine , but can see that for someone returning to riding they're a very good compromise between speed and comfort.
I wouldn't get a bike with front suspension forks on your bike if you're mostly riding on the road, they add weight and mean the maker will have cut costs elsewhere on the bike.
If I were picking a woman's hybrid bike in the 300-500 bracket, I'd go for this one.
Boardman Hybrid.
It is very light for a hybrid, the spec is good for the money and will be zippy, but gives you in a more comfy, more upright position than a road bike. Boardman Bikes are generally well thought out and get good reviews and certainly aren't a case of cashing in on the Boardman name like some former Olympians I could mention (cough, Pendleton cough).