Labrador howling for no reason.

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My 6 year old female Lab has just started to howl when she's in the garden in the morning, I figured this could be down to her being in season ,she has never done this before.

I Googled for an answer but only came up with the male dogs howling after a female in season locally.

Looking for more answers I dug deeper and could only find that a dog howls if it's unhappy or upset, she's not as far as I can tell.
Any light on this ,have you had similar?

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My wife doesn't want her sprayed , but as you said age related issues it maybe better in the long run.

There's nothing in the garden to upset her ,as I said she did a howl yesterday and today but still seems happy.

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Can't be at that time of the morning ,it's just the last two days.